Organic compounds
Organic compounds are a class of chemical compounds that contain one or more atoms of carbon covalently bonded to each other and atoms of other elements such as hydrogen, oxygen, nitrogen, sulfur, etc.
Compounds or allotropes of carbon that contain only carbon atoms are classified as inorganic compounds and exhibit novel properties.
This class of chemicals has a wide range of applications and includes graphite, diamond, and the more recently discovered graphene, fullerenes, and other carbon nanotubes. In fact, the majority of elements in the periodic table of elements are inorganic compounds.
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Tetrakis(triphenylphosphine)palladium(0), 99%
CAS: 14221-01-3 Molecular Formula: C72H60P4Pd Molecular Weight (g/mol): 1155.59 MDL Number: MFCD00010012 InChI Key: NFHFRUOZVGFOOS-UHFFFAOYSA-N Synonym: tetrakis triphenylphosphine palladium,tetrakis triphenylphosphine palladium 0,pd pph3 4,tetrakis triphenylphosphine palladium o,tetra triphenylphosphine palladium,palladium-tetrakis triphenylphosphine,palladium 0 tetrakis triphenylphosphine,palladium, tetrakis triphenylphosphine-, t-4 PubChem CID: 11979704 IUPAC Name: palladium;triphenylphosphane SMILES: [Pd].C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1
| PubChem CID | 11979704 |
|---|---|
| CAS | 14221-01-3 |
| Molecular Weight (g/mol) | 1155.59 |
| MDL Number | MFCD00010012 |
| SMILES | [Pd].C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C1=CC=C(C=C1)P(C1=CC=CC=C1)C1=CC=CC=C1 |
| Synonym | tetrakis triphenylphosphine palladium,tetrakis triphenylphosphine palladium 0,pd pph3 4,tetrakis triphenylphosphine palladium o,tetra triphenylphosphine palladium,palladium-tetrakis triphenylphosphine,palladium 0 tetrakis triphenylphosphine,palladium, tetrakis triphenylphosphine-, t-4 |
| IUPAC Name | palladium;triphenylphosphane |
| InChI Key | NFHFRUOZVGFOOS-UHFFFAOYSA-N |
| Molecular Formula | C72H60P4Pd |
Phenylcyclohexane 97.0+%, TCI America™
CAS: 827-52-1 Molecular Formula: C12H16 Molecular Weight (g/mol): 160.26 MDL Number: MFCD00001451 InChI Key: IGARGHRYKHJQSM-UHFFFAOYSA-N Synonym: phenylcyclohexane,benzene, cyclohexyl,cyclohexane, phenyl,cyclohexyl-benzene,cyclohexyl benzene,4-cyclohexylbenzene,santosol 360,phenyl cyclohexane,1,1'-biphenyl, 1,2,3,4,5,6-hexahydro,wln: l6tj ar PubChem CID: 13229 IUPAC Name: cyclohexylbenzene SMILES: C1CCC(CC1)C1=CC=CC=C1
| PubChem CID | 13229 |
|---|---|
| CAS | 827-52-1 |
| Molecular Weight (g/mol) | 160.26 |
| MDL Number | MFCD00001451 |
| SMILES | C1CCC(CC1)C1=CC=CC=C1 |
| Synonym | phenylcyclohexane,benzene, cyclohexyl,cyclohexane, phenyl,cyclohexyl-benzene,cyclohexyl benzene,4-cyclohexylbenzene,santosol 360,phenyl cyclohexane,1,1'-biphenyl, 1,2,3,4,5,6-hexahydro,wln: l6tj ar |
| IUPAC Name | cyclohexylbenzene |
| InChI Key | IGARGHRYKHJQSM-UHFFFAOYSA-N |
| Molecular Formula | C12H16 |
Allyl chloride, 98%, stabilized
CAS: 107-05-1 Molecular Formula: C3H5Cl Molecular Weight (g/mol): 76.53 MDL Number: MFCD00000984 InChI Key: OSDWBNJEKMUWAV-UHFFFAOYSA-N Synonym: allyl chloride,3-chloro-1-propene,1-propene, 3-chloro,3-chloropropylene,3-chloropropene,chlorallylene,allylchlorid,2-propenyl chloride,1-chloro-2-propene,allylchloride PubChem CID: 7850 ChEBI: CHEBI:82379 IUPAC Name: 3-chloroprop-1-ene SMILES: C=CCCl
| PubChem CID | 7850 |
|---|---|
| CAS | 107-05-1 |
| Molecular Weight (g/mol) | 76.53 |
| ChEBI | CHEBI:82379 |
| MDL Number | MFCD00000984 |
| SMILES | C=CCCl |
| Synonym | allyl chloride,3-chloro-1-propene,1-propene, 3-chloro,3-chloropropylene,3-chloropropene,chlorallylene,allylchlorid,2-propenyl chloride,1-chloro-2-propene,allylchloride |
| IUPAC Name | 3-chloroprop-1-ene |
| InChI Key | OSDWBNJEKMUWAV-UHFFFAOYSA-N |
| Molecular Formula | C3H5Cl |
Benzil, 99+%
CAS: 134-81-6 Molecular Formula: C14H10O2 Molecular Weight (g/mol): 210.23 MDL Number: MFCD00003080 InChI Key: WURBFLDFSFBTLW-UHFFFAOYSA-N Synonym: benzil,diphenylethanedione,dibenzoyl,diphenylglyoxal,bibenzoyl,ethanedione, diphenyl,1,2-diphenylethanedione,diphenylethane-1,2-dione,glyoxal, diphenyl,diphenyldiketon PubChem CID: 8651 ChEBI: CHEBI:51507 IUPAC Name: 1,2-diphenylethane-1,2-dione SMILES: O=C(C(=O)C1=CC=CC=C1)C1=CC=CC=C1
| PubChem CID | 8651 |
|---|---|
| CAS | 134-81-6 |
| Molecular Weight (g/mol) | 210.23 |
| ChEBI | CHEBI:51507 |
| MDL Number | MFCD00003080 |
| SMILES | O=C(C(=O)C1=CC=CC=C1)C1=CC=CC=C1 |
| Synonym | benzil,diphenylethanedione,dibenzoyl,diphenylglyoxal,bibenzoyl,ethanedione, diphenyl,1,2-diphenylethanedione,diphenylethane-1,2-dione,glyoxal, diphenyl,diphenyldiketon |
| IUPAC Name | 1,2-diphenylethane-1,2-dione |
| InChI Key | WURBFLDFSFBTLW-UHFFFAOYSA-N |
| Molecular Formula | C14H10O2 |
Tribenzylamine, 99+%
CAS: 620-40-6 Molecular Formula: C21H21N Molecular Weight (g/mol): 287.41 MDL Number: MFCD00004773 InChI Key: MXHTZQSKTCCMFG-UHFFFAOYSA-N Synonym: tribenzylamine,benzenemethanamine, n,n-bis phenylmethyl,unii-hz10o1931j,trisbenzylamine,n,n-dibenzyl-1-phenyl-methanamine,pubchem21076,acmc-1atok,dsstox_cid_27031,dsstox_rid_82052 PubChem CID: 24321 IUPAC Name: N,N-dibenzyl-1-phenylmethanamine SMILES: C(N(CC1=CC=CC=C1)CC1=CC=CC=C1)C1=CC=CC=C1
| PubChem CID | 24321 |
|---|---|
| CAS | 620-40-6 |
| Molecular Weight (g/mol) | 287.41 |
| MDL Number | MFCD00004773 |
| SMILES | C(N(CC1=CC=CC=C1)CC1=CC=CC=C1)C1=CC=CC=C1 |
| Synonym | tribenzylamine,benzenemethanamine, n,n-bis phenylmethyl,unii-hz10o1931j,trisbenzylamine,n,n-dibenzyl-1-phenyl-methanamine,pubchem21076,acmc-1atok,dsstox_cid_27031,dsstox_rid_82052 |
| IUPAC Name | N,N-dibenzyl-1-phenylmethanamine |
| InChI Key | MXHTZQSKTCCMFG-UHFFFAOYSA-N |
| Molecular Formula | C21H21N |
4-Nitrophenyl phosphate disodium salt hexahydrate, 96%
CAS: 333338-18-4 Molecular Formula: C6H4NNa2O6P Molecular Weight (g/mol): 263.05 MDL Number: MFCD00007319 InChI Key: VIYFPAMJCJLZKD-UHFFFAOYSA-L Synonym: pnpp,disodium 4-nitrophenylphosphate,sodium 4-nitrophenyl phosphate,disodium 4-nitrophenyl phosphate,phosphoric acid, mono 4-nitrophenyl ester, disodium salt,disodium p-nitrophenyl phosphate,phosphoric acid, mono 4-nitrophenyl ester, sodium salt 1:2,p-nitrophenyl phosphate,pnpp liquid substrate system PubChem CID: 77949 IUPAC Name: disodium;(4-nitrophenyl) phosphate SMILES: [Na+].[Na+].[O-][N+](=O)C1=CC=C(OP([O-])([O-])=O)C=C1
| PubChem CID | 77949 |
|---|---|
| CAS | 333338-18-4 |
| Molecular Weight (g/mol) | 263.05 |
| MDL Number | MFCD00007319 |
| SMILES | [Na+].[Na+].[O-][N+](=O)C1=CC=C(OP([O-])([O-])=O)C=C1 |
| Synonym | pnpp,disodium 4-nitrophenylphosphate,sodium 4-nitrophenyl phosphate,disodium 4-nitrophenyl phosphate,phosphoric acid, mono 4-nitrophenyl ester, disodium salt,disodium p-nitrophenyl phosphate,phosphoric acid, mono 4-nitrophenyl ester, sodium salt 1:2,p-nitrophenyl phosphate,pnpp liquid substrate system |
| IUPAC Name | disodium;(4-nitrophenyl) phosphate |
| InChI Key | VIYFPAMJCJLZKD-UHFFFAOYSA-L |
| Molecular Formula | C6H4NNa2O6P |
4-Aminobenzoic Acid 99.0+%, TCI America™
CAS: 150-13-0 Molecular Formula: C7H7NO2 Molecular Weight (g/mol): 137.14 MDL Number: MFCD00007894 InChI Key: ALYNCZNDIQEVRV-UHFFFAOYSA-N Synonym: p-aminobenzoic acid,paba,para-aminobenzoic acid,vitamin bx,sunbrella,p-carboxyaniline,4-carboxyaniline,hachemina,paraminol,benzoic acid, 4-amino PubChem CID: 978 ChEBI: CHEBI:30753 IUPAC Name: 4-aminobenzoic acid SMILES: NC1=CC=C(C=C1)C(O)=O
| PubChem CID | 978 |
|---|---|
| CAS | 150-13-0 |
| Molecular Weight (g/mol) | 137.14 |
| ChEBI | CHEBI:30753 |
| MDL Number | MFCD00007894 |
| SMILES | NC1=CC=C(C=C1)C(O)=O |
| Synonym | p-aminobenzoic acid,paba,para-aminobenzoic acid,vitamin bx,sunbrella,p-carboxyaniline,4-carboxyaniline,hachemina,paraminol,benzoic acid, 4-amino |
| IUPAC Name | 4-aminobenzoic acid |
| InChI Key | ALYNCZNDIQEVRV-UHFFFAOYSA-N |
| Molecular Formula | C7H7NO2 |
Polygalacturonic acid, M.W. 25,000-50,000
CAS: 25990-10-7 Molecular Formula: (C6H8O6)n Molecular Weight (g/mol): 194.14 MDL Number: MFCD00131972 InChI Key: AEMOLEFTQBMNLQ-BKBMJHBISA-N Synonym: galacturonan,alpha-d-galactopyranuronic acid,calcium pectate,sodium pectate,alpha-d-galacturonic acid,calcium polygalacturonate,pectate,d-galacturonan,sulfated polygalacturonic acid,galacturonate PubChem CID: 445929 ChEBI: CHEBI:33885 IUPAC Name: (2S,3R,4S,5R,6S)-3,4,5,6-tetrahydroxyoxane-2-carboxylic acid SMILES: O[C@@H]1[C@@H](O)[C@@H](O-*)[C@H](OC1-*)C(O)=O
| PubChem CID | 445929 |
|---|---|
| CAS | 25990-10-7 |
| Molecular Weight (g/mol) | 194.14 |
| ChEBI | CHEBI:33885 |
| MDL Number | MFCD00131972 |
| SMILES | O[C@@H]1[C@@H](O)[C@@H](O-*)[C@H](OC1-*)C(O)=O |
| Synonym | galacturonan,alpha-d-galactopyranuronic acid,calcium pectate,sodium pectate,alpha-d-galacturonic acid,calcium polygalacturonate,pectate,d-galacturonan,sulfated polygalacturonic acid,galacturonate |
| IUPAC Name | (2S,3R,4S,5R,6S)-3,4,5,6-tetrahydroxyoxane-2-carboxylic acid |
| InChI Key | AEMOLEFTQBMNLQ-BKBMJHBISA-N |
| Molecular Formula | (C6H8O6)n |
6-Methoxy-2(3H)-benzoxazolone, 98+%
CAS: 532-91-2 Molecular Formula: C8H7NO3 Molecular Weight (g/mol): 165.148 MDL Number: MFCD00051726 InChI Key: MKMCJLMBVKHUMS-UHFFFAOYSA-N Synonym: coixol,6-methoxy-2-benzoxazolinone,6-methoxybenzo d oxazol-2 3h-one,6-methoxybenzoxazolinone,mboa,6-mboa,6-methoxy-2 3h-benzoxazolone,2-benzoxazolinone, 6-methoxy,2 3h-benzoxazolone, 6-methoxy,6-methoxy-1,3-benzoxazol-2 3h-one PubChem CID: 10772 IUPAC Name: 6-methoxy-3H-1,3-benzoxazol-2-one SMILES: COC1=CC2=C(C=C1)NC(=O)O2
| PubChem CID | 10772 |
|---|---|
| CAS | 532-91-2 |
| Molecular Weight (g/mol) | 165.148 |
| MDL Number | MFCD00051726 |
| SMILES | COC1=CC2=C(C=C1)NC(=O)O2 |
| Synonym | coixol,6-methoxy-2-benzoxazolinone,6-methoxybenzo d oxazol-2 3h-one,6-methoxybenzoxazolinone,mboa,6-mboa,6-methoxy-2 3h-benzoxazolone,2-benzoxazolinone, 6-methoxy,2 3h-benzoxazolone, 6-methoxy,6-methoxy-1,3-benzoxazol-2 3h-one |
| IUPAC Name | 6-methoxy-3H-1,3-benzoxazol-2-one |
| InChI Key | MKMCJLMBVKHUMS-UHFFFAOYSA-N |
| Molecular Formula | C8H7NO3 |
Thermo Scientific Chemicals Chlorogenic acid, 98%
CAS: 327-97-9 Molecular Formula: C16H18O9 Molecular Weight (g/mol): 354.31 MDL Number: MFCD00003862 InChI Key: CWVRJTMFETXNAD-JUHZACGLSA-N Synonym: chlorogenic acid,3-caffeoylquinic acid,chlorogenate,3-o-caffeoylquinic acid,3-3,4-dihydroxycinnamoyl quinic acid,heriguard,hlorogenic acid,caffeoyl quinic acid,3-caffeoylquinate,unii-318adp12ri PubChem CID: 1794427 ChEBI: CHEBI:16112 IUPAC Name: (1S,3R,4R,5R)-3-[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy-1,4,5-trihydroxycyclohexane-1-carboxylic acid SMILES: O[C@@H]1C[C@](O)(C[C@@H](OC(=O)\C=C\C2=CC=C(O)C(O)=C2)[C@@H]1O)C(O)=O
| PubChem CID | 1794427 |
|---|---|
| CAS | 327-97-9 |
| Molecular Weight (g/mol) | 354.31 |
| ChEBI | CHEBI:16112 |
| MDL Number | MFCD00003862 |
| SMILES | O[C@@H]1C[C@](O)(C[C@@H](OC(=O)\C=C\C2=CC=C(O)C(O)=C2)[C@@H]1O)C(O)=O |
| Synonym | chlorogenic acid,3-caffeoylquinic acid,chlorogenate,3-o-caffeoylquinic acid,3-3,4-dihydroxycinnamoyl quinic acid,heriguard,hlorogenic acid,caffeoyl quinic acid,3-caffeoylquinate,unii-318adp12ri |
| IUPAC Name | (1S,3R,4R,5R)-3-[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy-1,4,5-trihydroxycyclohexane-1-carboxylic acid |
| InChI Key | CWVRJTMFETXNAD-JUHZACGLSA-N |
| Molecular Formula | C16H18O9 |
Benzylamine, 98+%
CAS: 100-46-9 Molecular Formula: C7H9N Molecular Weight (g/mol): 107.156 MDL Number: MFCD00008106 InChI Key: WGQKYBSKWIADBV-UHFFFAOYSA-N Synonym: benzylamine,benzenemethanamine,monobenzylamine,alpha-aminotoluene,phenylmethyl amine,aminomethyl benzene,1-phenylmethanamine,moringine,n-benzylamine,phenylmethylamine PubChem CID: 7504 ChEBI: CHEBI:40538 IUPAC Name: phenylmethanamine SMILES: C1=CC=C(C=C1)CN
| PubChem CID | 7504 |
|---|---|
| CAS | 100-46-9 |
| Molecular Weight (g/mol) | 107.156 |
| ChEBI | CHEBI:40538 |
| MDL Number | MFCD00008106 |
| SMILES | C1=CC=C(C=C1)CN |
| Synonym | benzylamine,benzenemethanamine,monobenzylamine,alpha-aminotoluene,phenylmethyl amine,aminomethyl benzene,1-phenylmethanamine,moringine,n-benzylamine,phenylmethylamine |
| IUPAC Name | phenylmethanamine |
| InChI Key | WGQKYBSKWIADBV-UHFFFAOYSA-N |
| Molecular Formula | C7H9N |
Thermo Scientific Chemicals 4-Epichlortetracycline hydrochloride, can be used as secondary standard
CAS: 101342-45-4 Molecular Formula: C22H23ClN2O8·ClH Molecular Weight (g/mol): 515.34 MDL Number: MFCD09842537 InChI Key: QYAPHLRPFNSDNH-PNEIEYGESA-N Synonym: epichlortetracycline hydrochloride PubChem CID: 92043146 IUPAC Name: (4R,4aS,5aS,6R,12aR)-7-chloro-4-(dimethylamino)-1,6,10,11,12a-pentahydroxy-6-methyl-3,12-dioxo-4,4a,5,5a-tetrahydrotetracene-2-carboxamide;hydrochloride SMILES: CC1(C2CC3C(C(=O)C(=C(C3(C(=O)C2=C(C4=C(C=CC(=C41)Cl)O)O)O)O)C(=O)N)N(C)C)O.Cl
| PubChem CID | 92043146 |
|---|---|
| CAS | 101342-45-4 |
| Molecular Weight (g/mol) | 515.34 |
| MDL Number | MFCD09842537 |
| SMILES | CC1(C2CC3C(C(=O)C(=C(C3(C(=O)C2=C(C4=C(C=CC(=C41)Cl)O)O)O)O)C(=O)N)N(C)C)O.Cl |
| Synonym | epichlortetracycline hydrochloride |
| IUPAC Name | (4R,4aS,5aS,6R,12aR)-7-chloro-4-(dimethylamino)-1,6,10,11,12a-pentahydroxy-6-methyl-3,12-dioxo-4,4a,5,5a-tetrahydrotetracene-2-carboxamide;hydrochloride |
| InChI Key | QYAPHLRPFNSDNH-PNEIEYGESA-N |
| Molecular Formula | C22H23ClN2O8·ClH |
beta-Carotene, 99%
CAS: 7235-40-7 Molecular Formula: C40H56 Molecular Weight (g/mol): 536.89 MDL Number: MFCD00001556 InChI Key: OENHQHLEOONYIE-JLTXGRSLSA-N Synonym: beta-carotene,beta carotene,betacarotene,beta,beta-carotene,provitamin a,solatene,carotaben,provatene,all-trans-beta-carotene,serlabo PubChem CID: 5280489 ChEBI: CHEBI:17579 IUPAC Name: 1,3,3-trimethyl-2-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-(2,6,6-trimethylcyclohexen-1-yl)octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohexene SMILES: C\C(\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C)=C/C=C/C=C(\C)/C=C/C=C(\C)/C=C/C1=C(C)CCCC1(C)C
| PubChem CID | 5280489 |
|---|---|
| CAS | 7235-40-7 |
| Molecular Weight (g/mol) | 536.89 |
| ChEBI | CHEBI:17579 |
| MDL Number | MFCD00001556 |
| SMILES | C\C(\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C)=C/C=C/C=C(\C)/C=C/C=C(\C)/C=C/C1=C(C)CCCC1(C)C |
| Synonym | beta-carotene,beta carotene,betacarotene,beta,beta-carotene,provitamin a,solatene,carotaben,provatene,all-trans-beta-carotene,serlabo |
| IUPAC Name | 1,3,3-trimethyl-2-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-(2,6,6-trimethylcyclohexen-1-yl)octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohexene |
| InChI Key | OENHQHLEOONYIE-JLTXGRSLSA-N |
| Molecular Formula | C40H56 |
Methyl methacrylate, 99%, stab.
CAS: 80-62-6 Molecular Formula: C5H8O2 MDL Number: MFCD00008587 InChI Key: VVQNEPGJFQJSBK-UHFFFAOYSA-N Synonym: methyl methacrylate,methylmethacrylate,methacrylic acid methyl ester,methyl methylacrylate,methyl 2-methylpropenoate,pegalan,methyl-methacrylat,diakon,acryester m,methyl 2-methyl-2-propenoate PubChem CID: 6658 ChEBI: CHEBI:34840 IUPAC Name: methyl 2-methylprop-2-enoate
| PubChem CID | 6658 |
|---|---|
| CAS | 80-62-6 |
| ChEBI | CHEBI:34840 |
| MDL Number | MFCD00008587 |
| Synonym | methyl methacrylate,methylmethacrylate,methacrylic acid methyl ester,methyl methylacrylate,methyl 2-methylpropenoate,pegalan,methyl-methacrylat,diakon,acryester m,methyl 2-methyl-2-propenoate |
| IUPAC Name | methyl 2-methylprop-2-enoate |
| InChI Key | VVQNEPGJFQJSBK-UHFFFAOYSA-N |
| Molecular Formula | C5H8O2 |
Butyryl chloride, 99%
CAS: 141-75-3 Molecular Formula: C4H7ClO Molecular Weight (g/mol): 106.55 MDL Number: MFCD00000752 InChI Key: DVECBJCOGJRVPX-UHFFFAOYSA-N Synonym: butyryl chloride,n-butyryl chloride,butyric acid chloride,butyroyl chloride,butyric chloride,butyrylchloride,unii-2xvm8e16ir,ccris 5989,n-butyric acid chloride,n-butanoyl chloride PubChem CID: 8855 IUPAC Name: butanoyl chloride SMILES: CCCC(Cl)=O
| PubChem CID | 8855 |
|---|---|
| CAS | 141-75-3 |
| Molecular Weight (g/mol) | 106.55 |
| MDL Number | MFCD00000752 |
| SMILES | CCCC(Cl)=O |
| Synonym | butyryl chloride,n-butyryl chloride,butyric acid chloride,butyroyl chloride,butyric chloride,butyrylchloride,unii-2xvm8e16ir,ccris 5989,n-butyric acid chloride,n-butanoyl chloride |
| IUPAC Name | butanoyl chloride |
| InChI Key | DVECBJCOGJRVPX-UHFFFAOYSA-N |
| Molecular Formula | C4H7ClO |