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1,2-BENZENEDICARBOXALDEHYDE

1,2-Benzenedicarboxaldehyde is a building block in the synthesis of heterocyclic compounds and a reagent in the analysis of amino acids.
1,2-Benzenedicarboxaldehyde is a chemical reagent that forms fluorescent conjugation products with primary amines and is used for the detection of many biogenic amines, peptides, and proteins in nanogram quantities in body fluids.
1,2-Benzenedicarboxaldehyde is commonly used as a high-level disinfectant for medical instruments and has been approved for high-level sterilization of heat-sensitive medical instruments, increasingly replacing glutaraldehyde in the healthcare industry.

CAS Number: 643-79-8
EC Number: 211-402-2
Chemical Formula: C8H6O2
Molar Mass: 134.134 g·mol−1

Synonyms: o-Phthalaldehyde, 643-79-8, PHTHALALDEHYDE, o-Phthaldialdehyde, 1,2-Benzenedicarboxaldehyde, Benzene-1,2-dicarboxaldehyde, Phthaldialdehyde, Phthalic aldehyde, Phthalic dialdehyde, Phthalyldicarboxaldehyde, ortho-Phthalaldehyde, Phthalic dicarboxaldehyde, o-Phthaldehyde, benzene-1,2-dicarbaldehyde, Phthalaldialdehyde, o-Phthalicdicarboxaldehyde, 1,2-Diformylbenzene, 2-PHTHALALDEHYDE, 1,2-Phthalic dicarboxaldehyde, ortho Phthalaldehyde, o-Phthalic dicarboxaldehyde, OPA, 1,2-BENZENEDICARBALDEHYDE, OPTA, NSC 13394, UNII-4P8QP9768A, CHEBI:70851, 2-PHTHALDIALDEHYDE, MFCD00003335, 4P8QP9768A, 1,2-Benzenedicarboxaldehyde, homopolymer, NCGC00166206-01, DSSTox_CID_12514, DSSTox_RID_78962, DSSTox_GSID_32514, 25750-62-3, Phtalaldehydes, Phtalaldehydes [French], CAS-643-79-8, EINECS 211-402-2, BRN 0878317, phthalaldehyd, o-Phthalaldehyd, o-phthal aldehyde, orthophthalaldehyde, Phtharal (JAN), Disopa (TN), 2-PHTHALDEHYDE, Phthaldialdehyde Reagent, o-Phthalaldehyde-[d6], ORTHO-PHTHALADEHYDE, Epitope ID:176774, O-PHTHALIC DIALDEHYDE, 2-Phthaldehyde, High purity, SCHEMBL33393, Benzene-1,2-dicarboxakdehyde, 4-07-00-02138, 1,2-Phthalic dicarboxyaldehyde, CHEMBL160145, Ortho-Phthalic Aldehyde (OPA), BENZENE-1,2-DIALDEHYDE, DTXSID6032514, HSDB 8456, TIMTEC-BB SBB008450, BCP29465, NSC13394, STR01056, ZINC1729594, Tox21_112347, Tox21_300404, 1,2-Benzenedialdehyde;Phthalaldehyde, BBL027435, NSC-13394, STK802214, AKOS000119186, Tox21_112347_1, AS03002, CS-W013385, LS11855, MCULE-5731001647, NCGC00166206-02, NCGC00166206-04, NCGC00254339-01, AC-10388, FLUORALDEHYDE(TM) O-PHTHALALDEHYDE, Phthaldialdehyde Reagent, Solution Complete, AM20050101, FT-0632732, P0280, Phthaldialdehyde Reagent, Solution Incomplete, 43P798, D03470, P-6600, SR-01000944839, Q5933776, SR-01000944839-, Phthaldialdehyde, for fluorescence, >=99.0% (HPLC), 6-Oxomethylene-5-[(E)-hydroxymethylene]cyclohexa-1,3-diene, 6-Oxomethylene-5-[(Z)-hydroxymethylene]cyclohexa-1,3-diene, Phthaldialdehyde, >=97% (HPLC), powder (may contain lumps), Phthaldialdehyde, suitable for HPLC fluorimetric detection of amino acids, >=99% (HPLC), powder, qw23r54

1,2-Benzenedicarboxaldehyde is the chemical compound with the formula C6H4(CHO)2. 
1,2-Benzenedicarboxaldehyde is one of three isomers of benzene dicarbaldehyde, related to phthalic acid. 

1,2-Benzenedicarboxaldehyde is a building block in the synthesis of heterocyclic compounds and a reagent in the analysis of amino acids. 
1,2-Benzenedicarboxaldehyde dissolves in water solution at pH < 11.5. 

1,2-Benzenedicarboxaldehydes solutions degrade upon UV illumination and exposure to air.
1,2-Benzenedicarboxaldehyde, Reagent is a reagent in the analysis of amino acids and involved in the synthesis of heterocyclic compounds. 

A reagent that forms fluorescent conjugation products with primary amines. 
1,2-Benzenedicarboxaldehyde is used for the detection of many biogenic amines, peptides, and proteins in nanogram quantities in body fluids.

Phthalaldehyde is the chemical compound with the formula C6H4(CHO)2. 
1,2-Benzenedicarboxaldehyde is one of three isomers of benzene dicarbaldehyde. 

1,2-Benzenedicarboxaldehyde is commonly used as a high-level disinfectant for medical instruments, as a polymerizer as well as in certain methods of wine making.
1,2-Benzenedicarboxaldehyde is the chemical compound with the formula C6H4(CHO)2. 

Often abbreviated 1,2-Benzenedicarboxaldehyde, the molecule is a dialdehyde, consisting of two formyl (CHO) groups attached to adjacent carbon centres on a benzene ring. 
This pale yellow solid is a building block in the synthesis of heterocyclic compounds and a reagent in the analysis of amino acids.

1,2-Benzenedicarboxaldehyde is a chemical reagent that forms fluorescent conjugation products with primary amines. 
1,2-Benzenedicarboxaldehyde is used for the detection of many biogenic amines, peptides, and proteins in nanogram quantities in body fluids. 

1,2-Benzenedicarboxaldehyde is approved by FDA for use in test systems to detect blood urea nitrogen (BUN) for the diagnosis and treatment of certain renal and metabolic diseases. 
1,2-Benzenedicarboxaldehyde is also a known desinfectant and has been approved for high-level sterilization of heat-sensitive medical instruments and is increasingly being used as a replacement in the healthcare industry for glutaraldehyde. 

1,2-Benzenedicarboxaldehyde has also been approved for use as an indoor antimicrobial pesticide; an intermediate for the synthesis of pharmaceuticals, medicines, and other organic compounds.

1,2-Benzenedicarboxaldehyde is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 10 to < 100 tonnes per annum.
1,2-Benzenedicarboxaldehyde is used by professional workers (widespread uses), in formulation or re-packing, at industrial sites and in manufacturing.

1,2-Benzenedicarboxaldehyde is a dialdehyde in which two formyl groups are attached to adjacent carbon centres on a benzene ring. 
1,2-Benzenedicarboxaldehyde has a role as an epitope. 
1,2-Benzenedicarboxaldehyde is a dialdehyde and a member of benzaldehydes.

Fluoraldehyde Reagent Solution contains 1,2-Benzenedicarboxaldehyde, which reacts with primary amines of amino acids, peptide and proteins to enable fluorescent detection and quantitation. 
The reagent is that can be used as a protein or peptide assay reagent or as a pre- or post-column detection reagent for amino acid analysis (HPLC). 

Reaction of 1,2-Benzenedicarboxaldehyde with proteins and peptides yields linear results over a wide range of concentrations. 
The Fluoraldehyde Reagent Solution is supplied ready to use and enables fast quantitation of proteins or peptides in solution.
Fast and catalyst-free cross-linking strategy is of great significance for construction of covalently cross-linked hydrogels. 

Here, we report the condensation reaction between 1,2-Benzenedicarboxaldehyde and N-nucleophiles (primary amine, hydrazide and aminooxy) for hydrogel formation for the first time. 

When four-arm poly(ethylene glycol) (4aPEG) capped with 1,2-Benzenedicarboxaldehyde was mixed with various N-nucleophile-terminated 4aPEG as building blocks, hydrogels were formed with superfast gelation rate, higher mechanical strength and markedly lower critical gelation concentrations, compared to benzaldehyde-based counterparts.
Small molecule model reactions indicate the key to these cross-links is the fast formation of heterocycle phthalimidine product or isoindole (bis)hemiaminal intermediates, depending on the N-nucleophiles. 

The second-order rate constant for the formation of phthalimidine linkage (4.3 M−1 s−1) is over 3000 times and 200 times higher than those for acylhydrazone and oxime formation from benzaldehyde, respectively, and comparable to many cycloaddition click reactions. 
Based on the versatile 1,2-Benzenedicarboxaldehyde chemistry, various hydrogels can be readily prepared from naturally derived polysaccharides, proteins or synthetic polymers without complicated chemical modification. 
Moreover, biofunctionalit is facilely imparted to the hydrogels by introducing amine-bearing peptides via the reaction between 1,2-Benzenedicarboxaldehyde and amino group.

1,2-Benzenedicarboxaldehyde is used in precolumn derivatization of amino acids for HPLC separation. 
1,2-Benzenedicarboxaldehyde is also used for flow cytometric measurements of protein thiol groups.

1,2-Benzenedicarboxaldehyde is reagent that forms fluorescent conjugation products with primary amines. 
1,2-Benzenedicarboxaldehyde is used for the detection of many biogenic amines, peptides, and proteins in nanogram quantities in body fluids.

1,2-Benzenedicarboxaldehyde can be polymerized. 
In the polymer, one of the oxygen atoms forms a bridge to the other non-ring carbon of the same 1,2-Benzenedicarboxaldehyde unit, while the other bridges to a non-ring carbon of another phthalaldehyde unit. 
1,2-Benzenedicarboxaldehyde is used in making a photoresist.

Uses of 1,2-Benzenedicarboxaldehyde:
1,2-Benzenedicarboxaldehyde can be widely used for precolumn derivatization of amino acids in HPLC separation or Capillary electrophoresis. 
1,2-Benzenedicarboxaldehyde used for flow cytometric measurements of protein thiol groups.

1,2-Benzenedicarboxaldehyde can be used for precolumn derivatization of amino acids for HPLC separation and for flow cytometric measurements of protein thiol groups.
1,2-Benzenedicarboxaldehyde is precolumn derivatization reagent for primary amines and amino acids. 

The fluorescent derivative can be detected by reverse-phase HPLC. 
The reaction requires 1,2-Benzenedicarboxaldehyde, primary amine and a sulfhydryl. 
In the presence of excess sulfhydryl, amines can be quantitated. 

1,2-Benzenedicarboxaldehyde can be used as disinfectant. 
1,2-Benzenedicarboxaldehyde is reagent in fluorometric determination of primary amines and thiols.
1,2-Benzenedicarboxaldehyde is used as a disinfectant and in the fluorometric determination of primary amines and thiols;Used to sterilize medical and dental equipment, as an enzyme inhibitor, indicator, chemical intermediate, diagnostic agent, tanning agent for leather, in water treatment, pulp and paper manufacturing, oil field water flooding, hair colorings, wood treatment, and antifouling paints

1,2-Benzenedicarboxaldehyde used in winemaking.
The Nitrogen by O-Phthaldialdehyde Assay (NOPA) is one of the methods used in winemaking to measure yeast assimilable nitrogen (or YAN) needed by wine yeast in order to successfully complete fermentation.

1,2-Benzenedicarboxaldehyde is used in the following products: biocides (e.g. disinfectants, pest control products).
1,2-Benzenedicarboxaldehyde is used in the following areas: health services.
Other release to the environment of 1,2-Benzenedicarboxaldehyde is likely to occur from: indoor use as processing aid and indoor use in close systems with minimal release (e.g. cooling liquids in refrigerators, oil-based electric heaters).

Applications of 1,2-Benzenedicarboxaldehyde:
1,2-Benzenedicarboxaldehyde is a compound used in precolumn derivatization of amino acids for HPLC separation.

Analytical reagents in the chemical field: As an amine alkaloid reagent, 1,2-Benzenedicarboxaldehyde is used for the determination of primary amines and peptide bond decomposition products by fluorescence method. 

Organic synthesis: also a pharmaceutical intermediate.

1,2-Benzenedicarboxaldehyde is fluorescent reagent for separating amino acid derivatives by HPLC before column chromatography, and measuring thiol groups of proteins by flow cytometry.

1,2-Benzenedicarboxaldehyde is used for precolumn derivatization of amino acids for HPLC separation and for flow cytometric measurements of protein thiol groups. 
1,2-Benzenedicarboxaldehyde is used for fluorometric determination of histamine, histidine and other amino acids. 
1,2-Benzenedicarboxaldehyde is also used for cholesterol assay in the picomole range.

1,2-Benzenedicarboxaldehyde is a compound that reacts with primary amines to produce a product that emits a highly fluorescent blue colour. 
1,2-Benzenedicarboxaldehyde is used for the quick visualization of histamine, characterized by the appearance of a yellow stain.
Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package

Typical Procedure:
5-10 µL aliquots of amino acid standards or unknown samples are mixed with 5 µL of a solution prepared by dissolving of 1,2-Benzenedicarboxaldehyde (50 mg) in absolute MeOH (1.25 mL) followed by the addition of 2-mercaptoethanol (50 µL) and 0.4 M sodium borate (pH 9.5) (11.2 mL). 
After 1 min, 0.1 M sodium acetate (pH 7.0) (20-100 µL) are added, the solution mixed and a 20-µL sample is subjected to analysis.

1,2-Benzenedicarboxaldehyde, in the presence of 2-mercaptoethanol, reacts with primary amines to form highly fluorescent products. 
Picomole quantities of amino acids, peptides, and proteins can be detected easily. 
1,2-Benzenedicarboxaldehyde is five to ten times more sensitive than fluorescamine and is soluble and stable in aqueous buffers.

1,2-Benzenedicarboxaldehyde has been used:
in the preparation of reagent for determining the degree of hydrolysis of milk proteins
in the measurement of free amino acids of milk samples by O-phthaldialdehyde/N-acetyl-L-cysteine (OPA/NAC) assay
in the derivatization of putrescine samples
For precolumn derivatization of amino acids for HPLC separation. 
For flow cytometric measurements of protein thiol groups.

Biochemistry of 1,2-Benzenedicarboxaldehyde:
1,2-Benzenedicarboxaldehyde is used in a very sensitive fluorescent reagent for assaying amines or sulfhydryls in solution, notably contained in proteins, peptides, and amino acids, by capillary electrophoresis and chromatography. 
1,2-Benzenedicarboxaldehyde reacts specifically with primary amines above their isoelectric point Pi in presence of thiols. 
1,2-Benzenedicarboxaldehyde reacts also with thiols in presence of an amine such as n-propylamine or 2-aminoethanol. 
The method is spectrometric (fluorescent emission at 436-475 nm (max 455 nm) with excitation at 330-390 nm (max. 340 nm)).

Preparation of 1,2-Benzenedicarboxaldehyde:
1,2-Benzenedicarboxaldehyde is a high-level chemical disinfectant that is commonly used for disinfection of dental and medical instruments as an alternative to glutaraldehyde, which is a known skin and respiratory sensitizer.
A variety of processes for manufacturing 1,2-Benzenedicarboxaldehyde have been reported in the literature.
1,2-Benzenedicarboxaldehyde is produced by heating pure benzaldehyde and chloroform with potassium hydroxide solution. 

The resulting solution is further acidified with hydrochloric acid and cooled to yield a colorless powder of 1,2-Benzenedicarboxaldehyde.
1,2-Benzenedicarboxaldehyde is also produced by ozonization of naphthalene in alcohol followed by catalytic hydrogenation.

Catalytic oxidation of various chemicals is also used in manufacturing 1,2-Benzenedicarboxaldehyde. 
1,2-Benzenedicarboxaldehyde can be manufactured by oxidation of phthalan by nitrogen monoxide in acetonitrile with N-hydroxyphthalimide as the catalyst to yield 80% to 90%.

Synthesis and Reactions of 1,2-Benzenedicarboxaldehyde:
1,2-Benzenedicarboxaldehyde was first described in 1887 when it was prepared from α,α,α’,α’-tetrachloro-ortho-xylene.
A more modern synthesis is similar: the hydrolysis of the related tetrabromo-o-xylene using potassium oxalate, followed by purification by steam distillation.

The reactivity of 1,2-Benzenedicarboxaldehyde is complicated by the fact that in water it forms both a mono- and dihydrate, C6H4(CHO)(CH(OH)2) and C6H4(CH(OH))2O, respectively. 
Phthalaldehydes reactions with nucleophiles often involves the reaction of both carbonyl groups.

1,2-Benzenedicarboxaldehyde is mainly used as a high-level disinfectant (a low-temperature chemical method) for heat-sensitive medical and dental equipment such as endoscopes and thermometers; in recent years, 1,2-Benzenedicarboxaldehyde has gained popularity as a safe and better alternative to glutaraldehyde.
There are some researches show, pH7.5 contains the sterilizing agent of 1,2-Benzenedicarboxaldehyde 0.5%, and its sterilizing power, sterilization speed, stability and toxicity all are better than glutaraldehyde, can kill mycobacterium in the 5min, the bacterium number reduces by 5 logarithmic value, and 1,2-Benzenedicarboxaldehyde is very stable, tasteless in pH3~9 scopes, non-stimulated to human nose, eye mucosa, and need not activate before using, various materials are had good consistency, have tangible microbiocidal activity.

The reactivity of 1,2-Benzenedicarboxaldehyde is complicated by the fact that in water it forms both a mono- and dihydrate, C6H4(CHO)(CH(OH)2) and C6H4(CH(OH))2O, respectively.
1,2-Benzenedicarboxaldehyde's reactions with nucleophiles often involves the reaction of both carbonyl groups.

Disinfection of 1,2-Benzenedicarboxaldehyde:
1,2-Benzenedicarboxaldehyde is commonly used as a high-level disinfectant for medical instruments, commonly sold under the brand names of Cidex 1,2-Benzenedicarboxaldehyde or TD-8. 
Disinfection with 1,2-Benzenedicarboxaldehyde is indicated for semi-critical instruments that come into contact with mucous membranes or broken skin, such as specula, laryngeal mirrors, and internal ultrasound probes.

Safety of 1,2-Benzenedicarboxaldehyde:
Flash Point: 132°C
DOT/IATA/IMDG: UN2923 - HC 8(6.1) - PG II
Risk Statements: R25,R34,R41,R43,R50
Safety Statements: S13,S22,S24/25,S26,S27,S36/37/39,S45,S61

Hazard Statements: H301-H314-H317-H400
Personal Protective Equipment: Faceshields, full-face respirator, Gloves, Goggles, respirator filter
Purity: ≥98%
RTECS Number: TH6950000
Safety Symbol: GHS05, GHS06, GHS09

Potential Exposure of 1,2-Benzenedicarboxaldehyde:
The primary routes of human exposure to 1,2-Benzenedicarboxaldehyde are by inhalation and through the skin, which may occur through accidental or occupational exposures. 
Along with 1,2-Benzenedicarboxaldehydes increasing popularity as a chemical sterilizer, 1,2-Benzenedicarboxaldehyde has many applications in analytical methods and in diagnostic kits. 

1,2-Benzenedicarboxaldehyde is also used as an intermediate in the synthesis of pharmaceuticals and as a reagent in the tanning industry, hair colorings, wood treatment, and antifouling paints. 
1,2-Benzenedicarboxaldehyde was approved for use as an indoor antimicrobial pesticide in 1997; however, 1,2-Benzenedicarboxaldehyde is no longer registered with the United States Environmental Protection Agency (USEPA) for this use.

Identifiers of 1,2-Benzenedicarboxaldehyde:
CAS Number: 643-79-8 
ChEBI: CHEBI:70851 check
ChemSpider: 4642 
ECHA InfoCard: 100.010.367
EC Number: 211-402-2
RTECS number: TH6950000
UNII: 4P8QP9768A 
UN number    2923
CompTox Dashboard (EPA): DTXSID6032514 
InChI: InChI=1S/C8H6O2/c9-5-7-3-1-2-4-8(7)6-10/h1-6H
SMILES: O=Cc1ccccc1C=O

Product Number: P0280
Purity / Analysis Method: >99.0%(GC)
Molecular Formula / Molecular Weight: C8H6O2 = 134.13  
Physical State (20 deg.C): Solid
Store Under Inert Gas: Store under inert gas
Condition to Avoid: Air Sensitive
CAS RN: 643-79-8
Reaxys Registry Number: 878317
PubChem Substance ID: 87574516
SDBS (AIST Spectral DB): 1434
Merck Index (14): 7368
MDL Number: MFCD00003335

Article No.: 05270
Grade: AR
CAS No.: 643-79-8
Molecular Formula: C8H6O2    
Molecular Weight: 134.14
H.S. Code: 2912.2990    
Shelf Life: 24 Months

CAS #: 643-79-8
EC Number: 211-402-2
Format: Crystals
Molecular Formula: C8H6O2
Molecular Weight: 134.134 g/mol

Appearance: Light yellow to Yellow to Green powder to crystal
Purity(GC): min. 99.0 %
Melting point: 55.0 to 58.0 °C

Properties of 1,2-Benzenedicarboxaldehyde:
Formulation: 0.8 mg/mL 1,2-Benzenedicarboxaldehyde in proprietary buffer, pH 10
Form: Clear, colorless to slightly yellow liquid
Reactive toward: Primary amines (—NH2)
Detection: Fluorescence (excitation/emission = 340 nm/455 nm)
Application: Pre- or post-column derivatization for detection by HPLC

Melting Point: 56 °C
Boiling Point: 84 °C/0.8 mmHg
Solubility (soluble in): Methanol

Chemical formula: C8H6O2
Molar mass: 134.134 g·mol−1
Appearance: Yellow solid
Density: 1.19 g/mL
Melting point: 55.5 to 56 °C (131.9 to 132.8 °F; 328.6 to 329.1 K)
Boiling point: 266.1 °C (511.0 °F; 539.2 K)
Solubility in water: Low

pH: 7
Melting Point: 54°C
Packaging: Glass Jar
Quantity: 5g
SMILES: O=CC1=CC=CC=C1C=O
Molecular Weight (g/mol): 134.13
ChEBI: CHEBI:70851
Physical Form: Solid

Molecular Weight: 134.13
XLogP3: 1.2
Hydrogen Bond Donor Count: 0    
Hydrogen Bond Acceptor Count: 2    
Rotatable Bond Count: 2    
Exact Mass: 134.036779430    
Monoisotopic Mass: 134.036779430    
Topological Polar Surface Area: 34.1 Ų    
Heavy Atom Count: 10    
Complexity: 115    
Isotope Atom Count: 0    
Defined Atom Stereocenter Count: 0    
Undefined Atom Stereocenter Count: 0    
Defined Bond Stereocenter Count: 0    
Undefined Bond Stereocenter Count: 0    
Covalently-Bonded Unit Count: 1    
Compound Is Canonicalized: Yes    

Specifications of 1,2-Benzenedicarboxaldehyde:
Label or Dye: OPA (o-phthaldialdehyde)
Quantity: 945 mL
Format: Liquid
Product Type: o-Phthaldialdehyde Reagent Solution
Chemical Reactivity: Amine
Product Line: Fluoraldehyde

Alternate Names: 2-Carboxybenzaldehyde; Phthaldialdehyde; o-Phthalic dicarboxaldehyde; Benzene-1,2-dicarboxaldehyde; OPA
Application Notes: 1,2-Benzenedicarboxaldehyde is used for precolumn derivatization of amino acids for HPLC separation and for flow cytometric measurements of protein thiol groups. Used for fluorometric determination of histamine, histidine and other amino acids. Also used for cholesterol assay in the picomole range.
Base Catalog Number: 102648
Beilstein Registry Number: 878317

Isomeric phthalaldehydes:
isophthalaldehyde (benzene-1,3-dicarbaldehyde)
terephthalaldehyde (benzene-1,4-dicarbaldehyde)

Names of 1,2-Benzenedicarboxaldehyde:

IUPAC name:
Phthalaldehyde

Preferred IUPAC name:
Benzene-1,2-dicarbaldehyde

Other name:
Benzene-1,2-dicarboxaldehyde
1,2-Benzenedicarboxaldehyde
o-Phthalic dicarboxaldehyde
Phthaldialdehyde

MeSH of 1,2-Benzenedicarboxaldehyde:
Aldehyde, ortho-Phthalic
o Phthalaldehyde
o Phthaldialdehyd
1,2-Benzenedicarboxaldehyde
o-Phthaldialdehyde
ortho Phthalaldehyde
ortho Phthalic Aldehyde
orth1,2-Benzenedicarboxaldehyde
ortho-Phthalic Aldehyde
Orthophthaldialdehyde
 

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