Hydroxycoumarins

4-Hydroxy-3-(3-oxo-1-phenylbutyl)coumarin, 97%, Acros Organics™

CAS: 81-81-2 Molecular Formula: C19H16O4 Molecular Weight (g/mol): 308.34 InChI Key: PJVWKTKQMONHTI-UHFFFAOYSA-N Synonym: coumadin, coumafen, coumafene, coumarins, coumefene, panwarfin, prothromadin, warfarin, warfarine, zoocoumarin PubChem CID: 54678486 ChEBI: CHEBI:87732 IUPAC Name: 4-hydroxy-3-(3-oxo-1-phenylbutyl)chromen-2-one SMILES: CC(=O)CC(C1=CC=CC=C1)C2=C(C3=CC=CC=C3OC2=O)O

Alfa Aesar™ 4-Hydroxycoumarin, 98+%

CAS: 1076-38-6 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.144 MDL Number: MFCD00006856 InChI Key: VXIXUWQIVKSKSA-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 4-hydroxy, 4-coumarinol, 4-hydroxy-1-benzopyran-2-one, 4-hydroxy-2h-1-benzopyran-2-one, 4-hydroxy-2h-chromen-2-one, 4-hydroxy-chromen-2-one, 4-hydroxycoumarin, benzotetronic acid, coumarin, 4-hydroxy, unii-x954zll2rd PubChem CID: 54682930 ChEBI: CHEBI:40070 IUPAC Name: 4-hydroxychromen-2-one SMILES: C1=CC=C2C(=C1)C(=CC(=O)O2)O

Esculin Monohydrate, ≥97.5%, MP Biomedicals™

CAS: 531-75-9 Molecular Formula: C15H16O9 Molecular Weight (g/mol): 340.284 MDL Number: MFCD00149492 InChI Key: XHCADAYNFIFUHF-TVKJYDDYSA-N Synonym: --esculin, 6,7-dihydroxycoumarin 6-glucoside, 6,7-dihydroxycoumarin-6-o-glucoside, aesculin, aesculinum, esculetin 6-o-glucoside, esculin, esculine, esculoside, polychrome PubChem CID: 5281417 ChEBI: CHEBI:4853 IUPAC Name: 7-hydroxy-6-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-2-one SMILES: C1=CC(=O)OC2=CC(=C(C=C21)OC3C(C(C(C(O3)CO)O)O)O)O

6-Bromo-4-hydroxycoumarin 98.0+%, TCI America™

CAS: 4139-61-1 Molecular Formula: C9H5BrO3 Molecular Weight (g/mol): 241.04 MDL Number: MFCD00239372 InChI Key: KNMCTCABMSGXGR-UHFFFAOYSA-N PubChem CID: 54691404 IUPAC Name: 6-bromo-4-hydroxychromen-2-one SMILES: C1=CC2=C(C=C1Br)C(=CC(=O)O2)O

Alfa Aesar™ 7-Hydroxycoumarin, 98%

CAS: 93-35-6 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.144 MDL Number: MFCD00006878 InChI Key: ORHBXUUXSCNDEV-UHFFFAOYSA-N Synonym: 7-hydroxy-2h-chromen-2-one, 7-hydroxycoumarin, 7-hydroxycoumarine, 7-oxycoumarin, hydrangin, hydrangine, skimmetin, skimmetine, umbelliferon, umbelliferone PubChem CID: 5281426 ChEBI: CHEBI:27510 IUPAC Name: 7-hydroxychromen-2-one SMILES: C1=CC(=CC2=C1C=CC(=O)O2)O

7-Hydroxy-4-methylcoumarin, 97%, ACROS Organics™

CAS: 90-33-5 Molecular Formula: C10H8O3 Molecular Weight (g/mol): 176.17 MDL Number: MFCD00006866 InChI Key: HSHNITRMYYLLCV-UHFFFAOYSA-N Synonym: 4-methyl-7-hydroxycoumarin, 4-methylumbelliferone, 7-hydroxy-4-methyl-2h-chromen-2-one, 7-hydroxy-4-methylcoumarin, beta-methylumbelliferone, bilcolic, cholestil, hymecromone, imecromone, mendiaxon PubChem CID: 5280567 ChEBI: CHEBI:17224 IUPAC Name: 7-hydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=C1C=CC(=C2)O

Alfa Aesar™ 7-Hydroxy-4-(methoxymethyl)coumarin, 98%

CAS: 157101-77-4 Molecular Formula: C11H10O4 Molecular Weight (g/mol): 206.197 MDL Number: MFCD00052607 InChI Key: PRVOZGKAZHXKMM-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 7-hydroxy-4-methoxymethyl, 7-hydroxy-4-methoxymethyl chromen-2-one, 7-hydroxy-4-methoxymethyl coumarin, 7-hydroxy-4-methoxymethyl-2h-chromen-2-one, 7-hydroxy-4-methoxymethyl-chromen-2-one, 7-hydroxy-4-methoxymethylcoumarin, acmc-20alx1 PubChem CID: 5393168 IUPAC Name: 7-hydroxy-4-(methoxymethyl)chromen-2-one SMILES: COCC1=CC(=O)OC2=C1C=CC(=C2)O

Alfa Aesar™ 6,7-Dihydroxycoumarin, 98+%

CAS: 305-01-1 Molecular Formula: C9H6O4 Molecular Weight (g/mol): 178.143 MDL Number: MFCD00006874 InChI Key: ILEDWLMCKZNDJK-UHFFFAOYSA-N Synonym: 6,7-dihydroxy-2h-chromen-2-one, 6,7-dihydroxycoumarin, aesculetin, cichorigenin, cichoriin aglucon, esculatin, esculetin, esculetol, esculin aglucon, esculin aglycon PubChem CID: 5281416 ChEBI: CHEBI:490095 IUPAC Name: 6,7-dihydroxychromen-2-one SMILES: C1=CC(=O)OC2=CC(=C(C=C21)O)O

4-Hydroxycoumarin 98.0+%, TCI America™

CAS: 1076-38-6 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.144 MDL Number: MFCD00006856 InChI Key: VXIXUWQIVKSKSA-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 4-hydroxy, 4-coumarinol, 4-hydroxy-1-benzopyran-2-one, 4-hydroxy-2h-1-benzopyran-2-one, 4-hydroxy-2h-chromen-2-one, 4-hydroxy-chromen-2-one, 4-hydroxycoumarin, benzotetronic acid, coumarin, 4-hydroxy, unii-x954zll2rd PubChem CID: 54682930 ChEBI: CHEBI:40070 IUPAC Name: 4-hydroxychromen-2-one SMILES: C1=CC=C2C(=C1)C(=CC(=O)O2)O

8-Acetyl-7-hydroxy-4-methylcoumarin 98.0+%, TCI America™

CAS: 2555-29-5 Molecular Formula: C12H10O4 Molecular Weight (g/mol): 218.208 InChI Key: WZOMQVFUPMLOGT-UHFFFAOYSA-N Synonym: 8-Acetyl-4-methylumbelliferone PubChem CID: 5324648 IUPAC Name: 8-acetyl-7-hydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=C1C=CC(=C2C(=O)C)O

Alfa Aesar™ Dicumarol

CAS: 66-76-2 Molecular Formula: C19H12O6 Molecular Weight (g/mol): 336.299 MDL Number: MFCD00006857 InChI Key: DOBMPNYZJYQDGZ-UHFFFAOYSA-N Synonym: acadyl, antitrombosin, baracoumin, bishydroxycoumarin, dicoumal, dicoumarin, dicoumarol, dicumarine, dicumarol, melitoxin PubChem CID: 54676038 ChEBI: CHEBI:4513 IUPAC Name: 4-hydroxy-3-[(4-hydroxy-2-oxochromen-3-yl)methyl]chromen-2-one SMILES: C1=CC=C2C(=C1)C(=C(C(=O)O2)CC3=C(C4=CC=CC=C4OC3=O)O)O

Dicumarol, 99%, ACROS Organics™

CAS: 66-76-2 Molecular Formula: C19H12O6 Molecular Weight (g/mol): 336.29 MDL Number: MFCD00006857 InChI Key: DOBMPNYZJYQDGZ-UHFFFAOYSA-N Synonym: acadyl, antitrombosin, baracoumin, bishydroxycoumarin, dicoumal, dicoumarin, dicoumarol, dicumarine, dicumarol, melitoxin PubChem CID: 54676038 ChEBI: CHEBI:4513 IUPAC Name: 4-hydroxy-3-[(4-hydroxy-2-oxochromen-3-yl)methyl]chromen-2-one SMILES: C1=CC=C2C(=C1)C(=C(C(=O)O2)CC3=C(C4=CC=CC=C4OC3=O)O)O

Scopoletin 98.0+%, TCI America™

CAS: 92-61-5 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00006872 InChI Key: RODXRVNMMDRFIK-UHFFFAOYSA-N Synonym: 6-methylesculetin, 6-o-methylesculetin, 7-hydroxy-6-methoxy-2h-chromen-2-one, 7-hydroxy-6-methoxycoumarin, chrysatropic acid, gelseminic acid, murrayetin, scopoletin, scopoletine, scopoletol PubChem CID: 5280460 ChEBI: CHEBI:17488 IUPAC Name: 7-hydroxy-6-methoxychromen-2-one SMILES: COC1=C(C=C2C(=C1)C=CC(=O)O2)O

Esculin hydrate, 97%, ACROS Organics™

CAS: 531-75-9 Molecular Formula: C15H16O9·xH2O Molecular Weight (g/mol): 340.29 MDL Number: MFCD00149492 InChI Key: XHCADAYNFIFUHF-TVKJYDDYSA-N Synonym: --esculin, 6,7-dihydroxycoumarin 6-glucoside, 6,7-dihydroxycoumarin-6-o-glucoside, aesculin, aesculinum, esculetin 6-o-glucoside, esculin, esculine, esculoside, polychrome PubChem CID: 5281417 ChEBI: CHEBI:4853 IUPAC Name: 7-hydroxy-6-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-2-one SMILES: C1=CC(=O)OC2=CC(=C(C=C21)OC3C(C(C(C(O3)CO)O)O)O)O

Dicoumarol 98.0+%, TCI America™

CAS: 66-76-2 Molecular Formula: C19H12O6 Molecular Weight (g/mol): 336.299 MDL Number: MFCD00006857 InChI Key: DOBMPNYZJYQDGZ-UHFFFAOYSA-N Synonym: acadyl, antitrombosin, baracoumin, bishydroxycoumarin, dicoumal, dicoumarin, dicoumarol, dicumarine, dicumarol, melitoxin PubChem CID: 54676038 ChEBI: CHEBI:4513 IUPAC Name: 4-hydroxy-3-[(4-hydroxy-2-oxochromen-3-yl)methyl]chromen-2-one SMILES: C1=CC=C2C(=C1)C(=C(C(=O)O2)CC3=C(C4=CC=CC=C4OC3=O)O)O

Alfa Aesar™ 7-Hydroxy-4-methyl-8-nitrocoumarin, 98%

CAS: 19037-69-5 Molecular Formula: C10H7NO5 Molecular Weight (g/mol): 221.168 MDL Number: MFCD00051824 InChI Key: BGUBUSIGKOWDPO-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 7-hydroxy-4-methyl-8-nitro, 2h-1-benzopyran-2-one,7-hydroxy-4-methyl-8-nitro, 7-hydroxy-4-methyl-8-nitro-2h-chromen-2-one, 7-hydroxy-4-methyl-8-nitro-2h-chromen-2-one #, 7-hydroxy-4-methyl-8-nitrocoumarin, 7-hydroxy-8-nitro-4-methyl-3-chromene-2-one, 7-hydroxy-8-nitro-4-methylcoumarin, acmc-20alwz, pubchem8690 PubChem CID: 5376327 IUPAC Name: 7-hydroxy-4-methyl-8-nitrochromen-2-one SMILES: CC1=CC(=O)OC2=C1C=CC(=C2[N+](=O)[O-])O

Scopoletin, 95%, ACROS Organics™

CAS: 92-61-5 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00006872 InChI Key: RODXRVNMMDRFIK-UHFFFAOYSA-N Synonym: 6-methylesculetin, 6-o-methylesculetin, 7-hydroxy-6-methoxy-2h-chromen-2-one, 7-hydroxy-6-methoxycoumarin, chrysatropic acid, gelseminic acid, murrayetin, scopoletin, scopoletine, scopoletol PubChem CID: 5280460 ChEBI: CHEBI:17488 IUPAC Name: 7-hydroxy-6-methoxychromen-2-one SMILES: COC1=C(C=C2C(=C1)C=CC(=O)O2)O

7-Hydroxycoumarinyl-4-acetic acid, 97%, ACROS Organics™

CAS: 6950-82-9 Molecular Formula: C11H8O5 Molecular Weight (g/mol): 220.18 MDL Number: MFCD00037563 InChI Key: BNHPMQBVNXMPDU-UHFFFAOYSA-N Synonym: 2-7-hydroxy-2-oxo-2h-chromen-4-yl acetic acid, 2-7-hydroxy-2-oxochromen-4-yl acetic acid, 2h-1-benzopyran-4-acetic acid, 7-hydroxy-2-oxo, 7-hydroxy-2-oxo-2h-1-benzopyran-4-acetic acid, 7-hydroxy-2-oxochromen-4-yl acetic acid, 7-hydroxy-4-coumarinylacetic acid, 7-hydroxycoumarin-4-acetic acid, 7-hydroxycoumarin-4-yl acetic acid, chembl12253, umbelliferone-4-acetic acid PubChem CID: 5338490 IUPAC Name: 2-(7-hydroxy-2-oxochromen-4-yl)acetic acid SMILES: C1=CC2=C(C=C1O)OC(=O)C=C2CC(=O)O

Alfa Aesar™ 4-Hydroxy-3-nitrocoumarin, 98%

CAS: 20261-31-8 Molecular Formula: C9H5NO5 Molecular Weight (g/mol): 207.141 MDL Number: MFCD00051671 InChI Key: NZQAQAUWFHMVEM-UHFFFAOYSA-N Synonym: 2-hydroxy-3-nitrochromen-4-one, 2h-1-benzopyran-2-one, 4-hydroxy-3-nitro, 2h-1-benzopyran-2-one,4-hydroxy-3-nitro, 3-nitro-4-hydroxycoumarin, 4-hydroxy-3-hydroxy oxido amino-2h-chromen-2-one, 4-hydroxy-3-nitro-2h-chromen-2-one, 4-hydroxy-3-nitro-chromen-2-one, 4-hydroxy-3-nitrocoumarin, acmc-20amh1, maybridge1_005221 PubChem CID: 54682640 IUPAC Name: 4-hydroxy-3-nitrochromen-2-one SMILES: C1=CC=C2C(=C1)C(=C(C(=O)O2)[N+](=O)[O-])O

Alfa Aesar™ 7,8-Dihydroxy-4-methylcoumarin, 97%

CAS: 2107-77-9 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00016972 InChI Key: NWQBYMPNIJXFNQ-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 7,8-dihydroxy-4-methyl, 4-methyl-7,8-dihydroxycoumarin, 4-methyldaphnetin, 4-methyldaphnetine, 7,8-dihydroxy-4-methyl-2-benzopyrone, 7,8-dihydroxy-4-methyl-2h-1-benzopyran-2-one, 7,8-dihydroxy-4-methyl-2h-chromen-2-one, 7,8-dihydroxy-4-methyl-chromen-2-one, 7,8-dihydroxy-4-methylcoumarin, coumarin, 7,8-dihydroxy-4-methyl PubChem CID: 5355836 IUPAC Name: 7,8-dihydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=C1C=CC(=C2O)O

Alfa Aesar™ 4-Methylumbelliferone, 97%

CAS: 90-33-5 Molecular Formula: C10H8O3 Molecular Weight (g/mol): 176.171 MDL Number: MFCD00006866 InChI Key: HSHNITRMYYLLCV-UHFFFAOYSA-N Synonym: 4-methyl-7-hydroxycoumarin, 4-methylumbelliferone, 7-hydroxy-4-methyl-2h-chromen-2-one, 7-hydroxy-4-methylcoumarin, beta-methylumbelliferone, bilcolic, cholestil, hymecromone, imecromone, mendiaxon PubChem CID: 5280567 ChEBI: CHEBI:17224 IUPAC Name: 7-hydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=C1C=CC(=C2)O

4-Hydroxycoumarin, 98%, ACROS Organics™

CAS: 1076-38-6 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.14 MDL Number: MFCD00006856 InChI Key: VXIXUWQIVKSKSA-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 4-hydroxy, 4-coumarinol, 4-hydroxy-1-benzopyran-2-one, 4-hydroxy-2h-1-benzopyran-2-one, 4-hydroxy-2h-chromen-2-one, 4-hydroxy-chromen-2-one, 4-hydroxycoumarin, benzotetronic acid, coumarin, 4-hydroxy, unii-x954zll2rd PubChem CID: 54682930 ChEBI: CHEBI:40070 IUPAC Name: 4-hydroxychromen-2-one SMILES: C1=CC=C2C(=C1)C(=CC(=O)O2)O

4-Hydroxy-3-nitrocoumarin 98.0+%, TCI America™

CAS: 20261-31-8 Molecular Formula: C9H5NO5 Molecular Weight (g/mol): 207.141 MDL Number: MFCD00051671 InChI Key: NZQAQAUWFHMVEM-UHFFFAOYSA-N Synonym: 2-hydroxy-3-nitrochromen-4-one, 2h-1-benzopyran-2-one, 4-hydroxy-3-nitro, 2h-1-benzopyran-2-one,4-hydroxy-3-nitro, 3-nitro-4-hydroxycoumarin, 4-hydroxy-3-hydroxy oxido amino-2h-chromen-2-one, 4-hydroxy-3-nitro-2h-chromen-2-one, 4-hydroxy-3-nitro-chromen-2-one, 4-hydroxy-3-nitrocoumarin, acmc-20amh1, maybridge1_005221 PubChem CID: 54682640 IUPAC Name: 4-hydroxy-3-nitrochromen-2-one SMILES: C1=CC=C2C(=C1)C(=C(C(=O)O2)[N+](=O)[O-])O

Umbelliferone 98.0+%, TCI America™

CAS: 93-35-6 Molecular Formula: C9H6O3 Molecular Weight (g/mol): 162.144 MDL Number: MFCD00006878 InChI Key: ORHBXUUXSCNDEV-UHFFFAOYSA-N Synonym: 7-hydroxy-2h-chromen-2-one, 7-hydroxycoumarin, 7-hydroxycoumarine, 7-oxycoumarin, hydrangin, hydrangine, skimmetin, skimmetine, umbelliferon, umbelliferone PubChem CID: 5281426 ChEBI: CHEBI:27510 IUPAC Name: 7-hydroxychromen-2-one SMILES: C1=CC(=CC2=C1C=CC(=O)O2)O

Alfa Aesar™ 6,7-Dihydroxy-4-methylcoumarin, 97%

CAS: 529-84-0 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00006859 InChI Key: KVOJTUXGYQVLAJ-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 6,7-dihydroxy-4-methyl, 4-methyl-6,7-dihydroxycoumarin, 4-methylaesculetin, 4-methylesculetin, 4-methylesculetol, 6,7-dihydroxy-4-methyl-2h-benzopyran-2-one, 6,7-dihydroxy-4-methyl-2h-chromen-2-one, 6,7-dihydroxy-4-methylcoumarin, coumarin, 6,7-dihydroxy-4-methyl, methylesculetin PubChem CID: 5319502 IUPAC Name: 6,7-dihydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=CC(=C(C=C12)O)O

6-Chloro-4-hydroxycoumarin 97.0+%, TCI America™

CAS: 19484-57-2 Molecular Formula: C9H5ClO3 Molecular Weight (g/mol): 196.586 MDL Number: MFCD00239399 InChI Key: HUMZENGQNOATEQ-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one,6-chloro-4-hydroxy, 4-hydroxy-6-chlorocoumarin, 6-chlor-4-oxy-cumarin, 6-chloro-2-hydroxy-4h-chromen-4-one, 6-chloro-2-hydroxychromen-4-one, 6-chloro-4-hydroxy-2h-1-benzopyran-2-one, 6-chloro-4-hydroxy-2h-chromen-2-one, 6-chloro-4-hydroxycoumarin, acmc-1bsui, pubchem24343 PubChem CID: 54686348 IUPAC Name: 6-chloro-4-hydroxychromen-2-one SMILES: C1=CC2=C(C=C1Cl)C(=CC(=O)O2)O

5,7-Dihydroxy-4-methylcoumarin 98.0+%, TCI America™

CAS: 2107-76-8 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00016966 InChI Key: QNVWGEJMXOQQPM-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 5,7-dihydroxy-4-methyl, 4-methyl-5,7-dihydroxycoumarin, 4-methyllimetol, 5,7-dihydroxy-4-methyl-2h-1-benzopyran-2-one, 5,7-dihydroxy-4-methyl-2h-chromen-2-one, 5,7-dihydroxy-4-methyl-chromen-2-one, 5,7-dihydroxy-4-methylcoumarin, chembl12252, coumarin, 5,7-dihydroxy-4-methyl, unii-vp62d4346m PubChem CID: 5354284 IUPAC Name: 5,7-dihydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=CC(=CC(=C12)O)O

Alfa Aesar™ 5,7-Dihydroxy-4-methylcoumarin, 98%

CAS: 2107-76-8 Molecular Formula: C10H8O4 Molecular Weight (g/mol): 192.17 MDL Number: MFCD00016966 InChI Key: QNVWGEJMXOQQPM-UHFFFAOYSA-N Synonym: 2h-1-benzopyran-2-one, 5,7-dihydroxy-4-methyl, 4-methyl-5,7-dihydroxycoumarin, 4-methyllimetol, 5,7-dihydroxy-4-methyl-2h-1-benzopyran-2-one, 5,7-dihydroxy-4-methyl-2h-chromen-2-one, 5,7-dihydroxy-4-methyl-chromen-2-one, 5,7-dihydroxy-4-methylcoumarin, chembl12252, coumarin, 5,7-dihydroxy-4-methyl, unii-vp62d4346m PubChem CID: 5354284 IUPAC Name: 5,7-dihydroxy-4-methylchromen-2-one SMILES: CC1=CC(=O)OC2=CC(=CC(=C12)O)O

7-Hydroxycoumarin-3-carboxylic Acid 98.0+%, TCI America™

CAS: 779-27-1 Molecular Formula: C10H6O5 Molecular Weight (g/mol): 206.153 MDL Number: MFCD00017491 InChI Key: LKLWLDOUZJEHDY-UHFFFAOYSA-N Synonym: Umbelliferone-3-carboxylic Acid PubChem CID: 5337757 IUPAC Name: 7-hydroxy-2-oxochromene-3-carboxylic acid SMILES: C1=CC2=C(C=C1O)OC(=O)C(=C2)C(=O)O

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