Furoic acids

3-Furoic acid, 99%, Thermo Scientific Chemicals

3-Furoic acid, 99%, Thermo Scientific Chemicals

CAS: 488-93-7 Molecular Formula: C5H4O3 Molecular Weight (g/mol): 112.08 MDL Number: MFCD00005350 InChI Key: IHCCAYCGZOLTEU-UHFFFAOYSA-N Synonym: acmc-209kee, pubchem6945, 3-furanoate, 3-furans, 3-furoate, unii-88a3s7rg98, 3-furanoic acid, 3-carboxyfuran, 3-furancarboxylic acid, 3-furoic acid PubChem CID: 10268 ChEBI: CHEBI:30846 IUPAC Name: furan-3-carboxylic acid SMILES: OC(=O)C1=COC=C1

5-(2-Phenyleth-1-ynyl)-2-furoic acid, Tech., Thermo Scientific™

5-(2-Phenyleth-1-ynyl)-2-furoic acid, Tech., Thermo Scientific™

CAS: 130423-83-5 Molecular Formula: C13H8O3 Molecular Weight (g/mol): 212.20 MDL Number: MFCD00541949 InChI Key: HFYACYZCOUYIFR-UHFFFAOYSA-N Synonym: 5-phenylethynyl-furan 2 carboxylic acid, 5-phenylethynyl-2-furoic acid, tech, acmc-20a65w, maybridge1_008982, 2-furancarboxylic acid,5-2-phenylethynyl, 5-phenylethynyl-2-furoic acid, 5-2-phenylethynyl furan-2-carboxylic acid, 5-2-phenyleth-1-ynyl-2-furoic acid, 5-phenylethynyl furan-2-carboxylic acid PubChem CID: 2737138 IUPAC Name: 5-(2-phenylethynyl)furan-2-carboxylic acid SMILES: OC(=O)C1=CC=C(O1)C#CC1=CC=CC=C1

5-(4-Cyanophenyl)-2-furoic acid, 95%, Thermo Scientific™

5-(4-Cyanophenyl)-2-furoic acid, 95%, Thermo Scientific™

CAS: 52938-94-0 Molecular Formula: C12H7NO3 Molecular Weight (g/mol): 213.192 MDL Number: MFCD06802004 InChI Key: QSWFKKSKRNCSDY-UHFFFAOYSA-N Synonym: 5-4-cyano-phenyl-furan-2-carboxylic acid, amtda011, 5-4-cyanophenyl-furane-2-carboxylic acid, 2-furancarboxylic acid, 5-4-cyanophenyl, 5-4-cyanophenyl-2-furoic acid, 5-4-cyanophenyl furan-2-carboxylic acid PubChem CID: 4189589 IUPAC Name: 5-(4-cyanophenyl)furan-2-carboxylic acid SMILES: C1=CC(=CC=C1C#N)C2=CC=C(O2)C(=O)O

Benzo[b]furan-2-carboxylic acid, 98+%, Thermo Scientific Chemicals

Benzo[b]furan-2-carboxylic acid, 98+%, Thermo Scientific Chemicals

CAS: 496-41-3 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.14 MDL Number: MFCD00005848 InChI Key: OFFSPAZVIVZPHU-UHFFFAOYSA-N Synonym: benzofuran-2-carboxylicacid, chembl84095, unii-7z6nmg947l, coumarone-2-carboxylic acid, 2-carboxybenzofuran, 2-benzofurancarboxylic acid, benzo b furan-2-carboxylic acid, coumarilic acid, benzofuran-2-carboxylic acid PubChem CID: 10331 IUPAC Name: 1-benzofuran-2-carboxylic acid SMILES: OC(=O)C1=CC2=CC=CC=C2O1

2,4-Dimethyl-3-furoic acid, 97%, Thermo Scientific™

2,4-Dimethyl-3-furoic acid, 97%, Thermo Scientific™

CAS: 15058-72-7 Molecular Formula: C7H8O3 Molecular Weight (g/mol): 140.138 InChI Key: JFXXYKVSLHRBAA-UHFFFAOYSA-N Synonym: 2,4-dimethylfurane-3-carboxylic acid, 2,4-dimethyl-furan-3-carboxylic acid, 3-furancarboxylic acid, 2,4-dimethyl, 2,4-dimethyl-3-furancarboxylic acid, 2,4-dimethyl-3-furoic acid PubChem CID: 638456 IUPAC Name: 2,4-dimethylfuran-3-carboxylic acid SMILES: CC1=COC(=C1C(=O)O)C

5-Methyl-2-phenyl-3-furoic acid, 97%, Thermo Scientific™

5-Methyl-2-phenyl-3-furoic acid, 97%, Thermo Scientific™

CAS: 64354-50-3 Molecular Formula: C12H10O3 Molecular Weight (g/mol): 202.209 MDL Number: MFCD00447900 InChI Key: CASZQQKUMVLKBY-UHFFFAOYSA-N Synonym: cambridge id 5926078, phenuvic acid, cbmicro_037588, 5-methyl-2-phenyl-furan-3-carboxylic acid, 3-furancarboxylic acid,5-methyl-2-phenyl, 5-methyl-2-phenyl-3-furoic acid PubChem CID: 761020 IUPAC Name: 5-methyl-2-phenylfuran-3-carboxylic acid SMILES: CC1=CC(=C(O1)C2=CC=CC=C2)C(=O)O

Furan-2,5-dicarboxylic acid, 98%, Thermo Scientific Chemicals

Furan-2,5-dicarboxylic acid, 98%, Thermo Scientific Chemicals

CAS: 3238-40-2 Molecular Formula: C6H4O5 Molecular Weight (g/mol): 156.09 MDL Number: MFCD00016582 InChI Key: CHTHALBTIRVDBM-UHFFFAOYSA-N Synonym: 2,5 furan dicarboxylic acid, furane-.alpha.,.alpha.'-dicarboxylic acid, furan-2,5-dicarboxylate, furan 2,5-dicarboxylic acid, furane-alpha,alpha'-dicarboxylic acid, 2,5-furandicarboxylate, 2,5-furandicarboxylicacid, furan-2,5-dicarbonsaeure, dehydromucic acid, 2,5-furandicarboxylic acid PubChem CID: 76720 ChEBI: CHEBI:84212 IUPAC Name: furan-2,5-dicarboxylic acid SMILES: OC(=O)C1=CC=C(O1)C(O)=O

3-Furoic acid, 99%, Thermo Scientific Chemicals

3-Furoic acid, 99%, Thermo Scientific Chemicals

CAS: 488-93-7 Molecular Formula: C5H4O3 Molecular Weight (g/mol): 112.08 MDL Number: MFCD00005350 InChI Key: IHCCAYCGZOLTEU-UHFFFAOYSA-N Synonym: acmc-209kee, pubchem6945, 3-furanoate, 3-furans, 3-furoate, unii-88a3s7rg98, 3-furanoic acid, 3-carboxyfuran, 3-furancarboxylic acid, 3-furoic acid PubChem CID: 10268 ChEBI: CHEBI:30846 IUPAC Name: furan-3-carboxylic acid SMILES: OC(=O)C1=COC=C1

5-({[5-(Trifluoromethyl)-2-pyridyl]thio}methyl)-2-furoic acid, 97%, Thermo Scientific™

5-({[5-(Trifluoromethyl)-2-pyridyl]thio}methyl)-2-furoic acid, 97%, Thermo Scientific™

CAS: 238742-86-4 Molecular Formula: C12H8F3NO3S Molecular Weight (g/mol): 303.26 MDL Number: MFCD00099971 InChI Key: MYDIGMNTURCKBI-UHFFFAOYSA-N Synonym: 5-5-trifluoromethyl pyridin-2-yl sulfanylmethyl furan-2-carboxylic acid, 5-5-trifluoromethyl pyridin-2-yl thio methyl furan-2-carboxylic acid, 2-furancarboxylicacid, 5-5-trifluoromethyl-2-pyridinyl thio methyl, 5-5-trifluoromethyl-2-pyridyl thiomethyl-2-furoic acid, maybridge1_004760, 5-5-trifluoromethyl pyridin-2-yl thiomethyl-2-furoic acid, 2-5-carboxyfurfurylthio-5-trifluoromethyl pyridine, 5-5-trifluoromethyl pyridin-2-yl sulfanyl methyl furan-2-carboxylic acid, 5-5-trifluoromethyl-2-pyridyl thio methyl-2-furoic acid PubChem CID: 2736458 IUPAC Name: 5-[[5-(trifluoromethyl)pyridin-2-yl]sulfanylmethyl]furan-2-carboxylic acid SMILES: OC(=O)C1=CC=C(CSC2=NC=C(C=C2)C(F)(F)F)O1

2-Furoic acid, 98%, Thermo Scientific Chemicals

2-Furoic acid, 98%, Thermo Scientific Chemicals

CAS: 88-14-2 MDL Number: MFCD00003238 InChI Key: SMNDYUVBFMFKNZ-UHFFFAOYSA-N Synonym: kyselina 2-furoova, 2-furanoic acid, alpha-furancarboxylic acid, alpha-furoic acid, furancarboxylic acid, furoic acid, 2-carboxyfuran, pyromucic acid, 2-furancarboxylic acid, 2-furoic acid PubChem CID: 6919 ChEBI: CHEBI:30845 IUPAC Name: furan-2-carboxylic acid SMILES: C1=COC(=C1)C(=O)O

5-tert-Butyl-2-methyl-3-furoic acid, 97%, Thermo Scientific Chemicals

5-tert-Butyl-2-methyl-3-furoic acid, 97%, Thermo Scientific Chemicals

CAS: 38422-62-7 Molecular Formula: C10H14O3 Molecular Weight (g/mol): 182.219 MDL Number: MFCD00221068 InChI Key: NWWAPYOVUAEIJB-UHFFFAOYSA-N Synonym: 5-? 1,?1-?dimethylethyl ?-?2-?methyl-3-?furancarboxylic acid, 5-tert-butyl-3-carboxy-2-methylfuran, acmc-20am1c, maybridge3_006912, 5-tert-butyl-2-methyl-3-furoic acid, 5-tert-butyl-2-methylfuran-3-carboxylic acid PubChem CID: 2742176 IUPAC Name: 5-tert-butyl-2-methylfuran-3-carboxylic acid SMILES: CC1=C(C=C(O1)C(C)(C)C)C(=O)O

3-Methyl-2-furoic acid, 98+%, Thermo Scientific Chemicals

3-Methyl-2-furoic acid, 98+%, Thermo Scientific Chemicals

CAS: 4412-96-8 Molecular Formula: C6H6O3 Molecular Weight (g/mol): 126.11 MDL Number: MFCD00014111 InChI Key: BNYIQEFWGSXIKQ-UHFFFAOYSA-N Synonym: acmc-20a5im, 3-methylpyromucic acid, 3-methyl furoic acid, methylpyromucic acid, 3-methyl-2-furoicacid, 3-methyl-furan-2-carboxylic acid, unii-5jp68392hm, 3-methyl-2-furancarboxylic acid, 2-furancarboxylic acid, 3-methyl, 3-methyl-2-furoic acid PubChem CID: 78127 IUPAC Name: 3-methylfuran-2-carboxylic acid SMILES: CC1=C(OC=C1)C(O)=O

3-Methylbenzo[b]furan-2-carboxylic acid, 97%, Thermo Scientific Chemicals

3-Methylbenzo[b]furan-2-carboxylic acid, 97%, Thermo Scientific Chemicals

CAS: 24673-56-1 Molecular Formula: C10H8O3 Molecular Weight (g/mol): 176.171 MDL Number: MFCD00060511 InChI Key: YMZTUCZCQMQFMK-UHFFFAOYSA-N Synonym: 2-benzofurancarboxylicacid, 3-methyl, 3-methylbenzofuran 2 carboxylic acid, 3-methylbenzofuran-2-carboxylicacid, acmc-1cp97, cambridge id 5100668, 3-methylbenzo b furan-2-carboxylic acid, 3-methyl-benzofuran-2-carboxylic acid, 3-methyl-2-benzofurancarboxylic acid, 2-benzofurancarboxylic acid, 3-methyl, 3-methylbenzofuran-2-carboxylic acid PubChem CID: 600591 IUPAC Name: 3-methyl-1-benzofuran-2-carboxylic acid SMILES: CC1=C(OC2=CC=CC=C12)C(=O)O

5-(3-Pyridinyloxy)-2-furoic acid, ≥97%, Thermo Scientific™

5-(3-Pyridinyloxy)-2-furoic acid, ≥97%, Thermo Scientific™

CAS: 852180-39-3 Molecular Formula: C10H7NO4 Molecular Weight (g/mol): 205.169 MDL Number: MFCD03407385 InChI Key: ZTYMSWYWSCYFAF-UHFFFAOYSA-N Synonym: 5-pyridin-3-yl oxy furan-2-carboxylic acid, 5-3-pyridinyl-oxy-2-furoic acid, 5-3-pyridyloxy furan-2-carboxylic acid, 2-furancarboxylic acid,5-3-pyridinyloxy, 5-pyridin-3-yloxy furan-2-carboxylic acid, 5-3-pyridinyloxy-2-furoic acid PubChem CID: 7060545 IUPAC Name: 5-pyridin-3-yloxyfuran-2-carboxylic acid SMILES: C1=CC(=CN=C1)OC2=CC=C(O2)C(=O)O

2-Methyl-3-furoic acid, 98%, Thermo Scientific Chemicals

2-Methyl-3-furoic acid, 98%, Thermo Scientific Chemicals

CAS: 6947-94-0 Molecular Formula: C6H6O3 Molecular Weight (g/mol): 126.111 MDL Number: MFCD00092314 InChI Key: CFGQZVOVFIZRMN-UHFFFAOYSA-N PubChem CID: 244756 IUPAC Name: 2-methylfuran-3-carboxylic acid SMILES: CC1=C(C=CO1)C(=O)O

5-Phenoxy-2-furoic acid, ≥97%, Thermo Scientific™

5-Phenoxy-2-furoic acid, ≥97%, Thermo Scientific™

CAS: 60698-32-0 Molecular Formula: C11H8O4 Molecular Weight (g/mol): 204.18 MDL Number: MFCD01925067 InChI Key: QQKXTFLRAZKJJO-UHFFFAOYSA-N Synonym: 5-phenoxypyromucic acid, maybridge3_002285, 5-phenoxy-furan-2-carboxylic acid, 2-furancarboxylic acid,5-phenoxy, 5-phenoxy-2-furoic acid PubChem CID: 2812790 IUPAC Name: 5-phenoxyfuran-2-carboxylic acid SMILES: OC(=O)C1=CC=C(OC2=CC=CC=C2)O1

4,5-Dimethyl-2-furoic acid, 97%, Thermo Scientific™

4,5-Dimethyl-2-furoic acid, 97%, Thermo Scientific™

CAS: 89639-83-8 Molecular Formula: C7H8O3 Molecular Weight (g/mol): 140.138 MDL Number: MFCD00085031 InChI Key: BNVXYXRSJIWWDX-UHFFFAOYSA-N PubChem CID: 2774924 IUPAC Name: 4,5-dimethylfuran-2-carboxylic acid SMILES: CC1=C(OC(=C1)C(=O)O)C

2-Furoic acid, 98%, Thermo Scientific Chemicals

2-Furoic acid, 98%, Thermo Scientific Chemicals

CAS: 88-14-2 Molecular Formula: C5H4O3 Molecular Weight (g/mol): 112.084 MDL Number: MFCD00003238 InChI Key: SMNDYUVBFMFKNZ-UHFFFAOYSA-N Synonym: kyselina 2-furoova, 2-furanoic acid, alpha-furancarboxylic acid, alpha-furoic acid, furancarboxylic acid, furoic acid, 2-carboxyfuran, pyromucic acid, 2-furancarboxylic acid, 2-furoic acid PubChem CID: 6919 ChEBI: CHEBI:30845 IUPAC Name: furan-2-carboxylic acid SMILES: C1=COC(=C1)C(=O)O

Benzo[b]furan-2-carboxylic acid, 98%, Thermo Scientific Chemicals

Benzo[b]furan-2-carboxylic acid, 98%, Thermo Scientific Chemicals

CAS: 496-41-3 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.14 MDL Number: MFCD00005848 InChI Key: OFFSPAZVIVZPHU-UHFFFAOYSA-N Synonym: benzofuran-2-carboxylicacid, chembl84095, unii-7z6nmg947l, coumarone-2-carboxylic acid, 2-carboxybenzofuran, 2-benzofurancarboxylic acid, benzo b furan-2-carboxylic acid, coumarilic acid, benzofuran-2-carboxylic acid PubChem CID: 10331 IUPAC Name: 1-benzofuran-2-carboxylic acid SMILES: OC(=O)C1=CC2=CC=CC=C2O1

5-(4-Chlorophenyl)-2-methyl-3-furoic acid, ≥97%, Thermo Scientific™

5-(4-Chlorophenyl)-2-methyl-3-furoic acid, ≥97%, Thermo Scientific™

CAS: 111787-89-4 Molecular Formula: C12H9ClO3 Molecular Weight (g/mol): 236.65 MDL Number: MFCD00275560 InChI Key: HUQOLZUHGMRQFS-UHFFFAOYSA-N PubChem CID: 2742181 IUPAC Name: 5-(4-chlorophenyl)-2-methylfuran-3-carboxylic acid SMILES: CC1=C(C=C(O1)C1=CC=C(Cl)C=C1)C(O)=O

5-Methyl-2-(trifluoromethyl)-3-furoic acid, 97%, Thermo Scientific™

5-Methyl-2-(trifluoromethyl)-3-furoic acid, 97%, Thermo Scientific™

CAS: 17515-74-1 Molecular Formula: C7H5F3O3 Molecular Weight (g/mol): 194.11 MDL Number: MFCD00275563 InChI Key: NURNFMNHTHXTDS-UHFFFAOYSA-N PubChem CID: 2782183 IUPAC Name: 5-methyl-2-(trifluoromethyl)furan-3-carboxylic acid SMILES: CC1=CC(C(O)=O)=C(O1)C(F)(F)F

5-Chlorobenzo[b]furan-2-carboxylic acid, 97%, Thermo Scientific Chemicals

5-Chlorobenzo[b]furan-2-carboxylic acid, 97%, Thermo Scientific Chemicals

CAS: 10242-10-1 Molecular Formula: C9H4ClO3 Molecular Weight (g/mol): 195.58 MDL Number: MFCD00060512 InChI Key: JETRXAHRPACNMA-UHFFFAOYSA-M Synonym: 5-chlo-robenzofuran-2-carboxylic acid, acmc-20am44, 5-chlorocoumarilic acid, 5-chloro-2-benzofurancarboxylic acid, 2-carboxy-5-chlorobenzo b furan, 2-benzofurancarboxylicacid, 5-chloro, 2-benzofurancarboxylic acid, 5-chloro, 5-chloro-benzofuran-2-carboxylic acid, 5-chlorobenzo b furan-2-carboxylic acid, 5-chlorobenzofuran-2-carboxylic acid PubChem CID: 937838 IUPAC Name: 5-chloro-1-benzofuran-2-carboxylic acid SMILES: [O-]C(=O)C1=CC2=CC(Cl)=CC=C2O1

2-Methyl-5-phenyl-3-furoic acid, 97%, Thermo Scientific Chemicals

2-Methyl-5-phenyl-3-furoic acid, 97%, Thermo Scientific Chemicals

CAS: 108124-17-0 Molecular Formula: C12H9O3 Molecular Weight (g/mol): 201.20 MDL Number: MFCD00221070 InChI Key: VLMNACSEESRUAK-UHFFFAOYSA-M Synonym: 2-methyl-5-phenyl-furan-3-carboxylic acid, 2-methyl-5-phenyl-3-furancarboxylic acid, cambridge id 5930829, cbmicro_037931, maybridge1_002369, acmc-1bptp, 3-furancarboxylic acid,2-methyl-5-phenyl, 3-furancarboxylic acid, 2-methyl-5-phenyl, 2-methyl-5-phenyl-3-furoic acid PubChem CID: 736516 SMILES: CC1=C(C=C(O1)C1=CC=CC=C1)C([O-])=O

5-(4-Chlorophenyl)-2-furoic acid, 95+%, Thermo Scientific Chemicals

5-(4-Chlorophenyl)-2-furoic acid, 95+%, Thermo Scientific Chemicals

CAS: 41019-45-8 Molecular Formula: C11H6ClO3 Molecular Weight (g/mol): 221.62 MDL Number: MFCD00216587 InChI Key: XIPQHWUSDHTXOO-UHFFFAOYSA-M PubChem CID: 726693 SMILES: [O-]C(=O)C1=CC=C(O1)C1=CC=C(Cl)C=C1

5-Bromofuroic acid, 99%, Thermo Scientific Chemicals

5-Bromofuroic acid, 99%, Thermo Scientific Chemicals

CAS: 585-70-6 Molecular Formula: C5H3BrO3 Molecular Weight (g/mol): 190.98 InChI Key: YVTQHZDUDUCGRD-UHFFFAOYSA-N Synonym: 5-bromofuroic?acid, t5oj bvq ee, 2-furoic acid, 5-bromo, 5-bromo furan-2-carboxylic acid, 5-bromo-2-furanecarboxylic acid, 2-furancarboxylic acid, 5-bromo, 5-bromo-2-furancarboxylic acid, 5-bromo-furan-2-carboxylic acid, 5-bromofuroic acid, 5-bromo-2-furoic acid PubChem CID: 68511 IUPAC Name: 5-bromofuran-2-carboxylic acid SMILES: C1=C(OC(=C1)Br)C(=O)O

2,6-Diphenylphenol, 98%, Thermo Scientific Chemicals

2,6-Diphenylphenol, 98%, Thermo Scientific Chemicals

CAS: 2432-11-3 MDL Number: MFCD00009716

5-(3-Methoxyphenyl)-2-furoic acid, 97%, Thermo Scientific™

5-(3-Methoxyphenyl)-2-furoic acid, 97%, Thermo Scientific™

CAS: 54022-96-7 Molecular Formula: C12H10O4 Molecular Weight (g/mol): 218.21 MDL Number: MFCD05022489 InChI Key: RIIFZAPFLSKUTL-UHFFFAOYSA-N Synonym: 5-3-methoxy-phenyl-furan-2-carboxylic acid, 2-furancarboxylic acid,5-3-methoxyphenyl, 2-furancarboxylic acid, 5-3-methoxyphenyl, 5-3-methoxyphenyl furan-2-carboxylic acid, 5-3-methoxyphenyl-2-furoic acid PubChem CID: 2794680 IUPAC Name: 5-(3-methoxyphenyl)furan-2-carboxylic acid SMILES: COC1=CC=CC(=C1)C1=CC=C(O1)C(O)=O

7-Methoxybenzo[b]furan-2-carboxylic acid, 97%, Thermo Scientific™

7-Methoxybenzo[b]furan-2-carboxylic acid, 97%, Thermo Scientific™

CAS: 4790-79-8 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00060516 InChI Key: UOCNTRAAJNWDND-UHFFFAOYSA-N Synonym: 7methoxybenzofuran-2-carboxylic acid, ksc236k1t, acmc-1am7f, 7-methoxybenzofuran-2-carboxylicacid, 7-methoxy-benzofuran-2-carboxylic acid, 7-methoxy-2-benzofurancarboxylic acid, 2-benzofurancarboxylic acid, 7-methoxy, 7-methoxybenzo b furan-2-carboxylic acid, 7-methoxybenzofuran-2-carboxylic acid PubChem CID: 606037 IUPAC Name: 7-methoxy-1-benzofuran-2-carboxylic acid SMILES: COC1=CC=CC2=C1OC(=C2)C(=O)O

5-Bromobenzo[b]furan-2-carboxylic acid 97+%, Thermo Scientific™

5-Bromobenzo[b]furan-2-carboxylic acid 97+%, Thermo Scientific™

CAS: 10242-11-2 Molecular Formula: C9H5BrO3 Molecular Weight (g/mol): 241.04 InChI Key: QKUWZCOVKRUXKX-UHFFFAOYSA-N Synonym: 5-bromo benzo furan 2-carboxylic acid, buttpark 34\07-74, acmc-1bxoo, 5-bromo-benzofuran-2-carboxylic acid, 2-benzofurancarboxylicacid, 5-bromo, 5-bromo-2-benzofurancarboxylic acid, 5-bromo-2-carboxy-1-benzofuran, 5-bromobenzo b furan-2-carboxylic acid, 2-benzofurancarboxylic acid, 5-bromo, 5-bromobenzofuran-2-carboxylic acid PubChem CID: 735247 IUPAC Name: 5-bromo-1-benzofuran-2-carboxylic acid SMILES: C1=CC2=C(C=C1Br)C=C(O2)C(=O)O

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