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.
Filtered Search Results
3-Nitropyrazole 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 26621-44-3 Molecular Formula: C3H3N3O2 Molecular Weight (g/mol): 113.08 MDL Number: MFCD00159621,MFCD00238787 InChI Key: MZRUFMBFIKGOAL-UHFFFAOYSA-N Synonym: 3-nitro-1h-pyrazole,3-nitropyrazole,1h-pyrazole, 3-nitro,3-nitro-2h-pyrazole,nitropyrazole,pyrazole, 3-nitro,5-nitro-1h-pyrazol,djw 94,djw-94,5-nitropyrazole PubChem CID: 123419 IUPAC Name: 5-nitro-1H-pyrazole SMILES: [O-][N+](=O)C1=CC=NN1
| PubChem CID | 123419 |
|---|---|
| CAS | 26621-44-3 |
| Molecular Weight (g/mol) | 113.08 |
| MDL Number | MFCD00159621,MFCD00238787 |
| SMILES | [O-][N+](=O)C1=CC=NN1 |
| Synonym | 3-nitro-1h-pyrazole,3-nitropyrazole,1h-pyrazole, 3-nitro,3-nitro-2h-pyrazole,nitropyrazole,pyrazole, 3-nitro,5-nitro-1h-pyrazol,djw 94,djw-94,5-nitropyrazole |
| IUPAC Name | 5-nitro-1H-pyrazole |
| InChI Key | MZRUFMBFIKGOAL-UHFFFAOYSA-N |
| Molecular Formula | C3H3N3O2 |
Bis[1,2-bis(diphenylphosphino)ethane]palladium(0) 96.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 31277-98-2 Molecular Formula: C52H48P4Pd Molecular Weight (g/mol): 903.27 MDL Number: MFCD00009880 InChI Key: FAFGMAGIYHHRKN-UHFFFAOYSA-N Synonym: bis 1,2-bis diphenylphosphino ethane palladium 0,pd dppe 2,pd diphos 2,bis diphos palladium 0,bis 1,2-bis diphenylphosphino ethane palladium,bis diphos palladium,bis 1,2-bis diphenylphosphino ethane-palladium 0,bis 1,2-bis diphenylphosphino ethane-palladium PubChem CID: 2724231 IUPAC Name: bis([2-(diphenylphosphanyl)ethyl]diphenylphosphane) palladium SMILES: [Pd].C(CP(C1=CC=CC=C1)C1=CC=CC=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C(CP(C1=CC=CC=C1)C1=CC=CC=C1)P(C1=CC=CC=C1)C1=CC=CC=C1
| PubChem CID | 2724231 |
|---|---|
| CAS | 31277-98-2 |
| Molecular Weight (g/mol) | 903.27 |
| MDL Number | MFCD00009880 |
| SMILES | [Pd].C(CP(C1=CC=CC=C1)C1=CC=CC=C1)P(C1=CC=CC=C1)C1=CC=CC=C1.C(CP(C1=CC=CC=C1)C1=CC=CC=C1)P(C1=CC=CC=C1)C1=CC=CC=C1 |
| Synonym | bis 1,2-bis diphenylphosphino ethane palladium 0,pd dppe 2,pd diphos 2,bis diphos palladium 0,bis 1,2-bis diphenylphosphino ethane palladium,bis diphos palladium,bis 1,2-bis diphenylphosphino ethane-palladium 0,bis 1,2-bis diphenylphosphino ethane-palladium |
| IUPAC Name | bis([2-(diphenylphosphanyl)ethyl]diphenylphosphane) palladium |
| InChI Key | FAFGMAGIYHHRKN-UHFFFAOYSA-N |
| Molecular Formula | C52H48P4Pd |
2-Amino-3-bromo-5-chloropyridine 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 26163-03-1 Molecular Formula: C5H4BrClN2 Molecular Weight (g/mol): 207.455 MDL Number: MFCD00955627 InChI Key: UWGGGYYCKDCTGN-UHFFFAOYSA-N Synonym: 2-amino-3-bromo-5-chloropyridine,3-bromo-5-chloro-2-pyridinamine,2-pyridinamine, 3-bromo-5-chloro,3-bromo-5-chloro-2-pyridylamine,3-bromo-5-chloropyrid-2-ylamine,3-bromo-5-chloro-pyridin-2-ylamine,abbypharma ap-10-5406,3-bromo-5-chloro-pyridin-2-amine,pubchem1141,acmc-1ch3b PubChem CID: 2763971 IUPAC Name: 3-bromo-5-chloropyridin-2-amine SMILES: C1=C(C=NC(=C1Br)N)Cl
| PubChem CID | 2763971 |
|---|---|
| CAS | 26163-03-1 |
| Molecular Weight (g/mol) | 207.455 |
| MDL Number | MFCD00955627 |
| SMILES | C1=C(C=NC(=C1Br)N)Cl |
| Synonym | 2-amino-3-bromo-5-chloropyridine,3-bromo-5-chloro-2-pyridinamine,2-pyridinamine, 3-bromo-5-chloro,3-bromo-5-chloro-2-pyridylamine,3-bromo-5-chloropyrid-2-ylamine,3-bromo-5-chloro-pyridin-2-ylamine,abbypharma ap-10-5406,3-bromo-5-chloro-pyridin-2-amine,pubchem1141,acmc-1ch3b |
| IUPAC Name | 3-bromo-5-chloropyridin-2-amine |
| InChI Key | UWGGGYYCKDCTGN-UHFFFAOYSA-N |
| Molecular Formula | C5H4BrClN2 |
Cresol, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 1319-77-3 Molecular Formula: C7H8O MDL Number: MFCD00151099 Synonym: Cresylic Acid, Tricresol
| CAS | 1319-77-3 |
|---|---|
| MDL Number | MFCD00151099 |
| Synonym | Cresylic Acid, Tricresol |
| Molecular Formula | C7H8O |
2-[(Acetylthio)methyl]-3-phenylpropionic Acid 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 91702-98-6 Molecular Formula: C12H14O3S Molecular Weight (g/mol): 238.301 MDL Number: MFCD00236751 InChI Key: BCAAXVOKLXDSPD-UHFFFAOYSA-N PubChem CID: 9991796 IUPAC Name: 2-(acetylsulfanylmethyl)-3-phenylpropanoic acid SMILES: CC(=O)SCC(CC1=CC=CC=C1)C(=O)O
| PubChem CID | 9991796 |
|---|---|
| CAS | 91702-98-6 |
| Molecular Weight (g/mol) | 238.301 |
| MDL Number | MFCD00236751 |
| SMILES | CC(=O)SCC(CC1=CC=CC=C1)C(=O)O |
| IUPAC Name | 2-(acetylsulfanylmethyl)-3-phenylpropanoic acid |
| InChI Key | BCAAXVOKLXDSPD-UHFFFAOYSA-N |
| Molecular Formula | C12H14O3S |
S-(2-Carboxyethyl)-L-cysteine 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 4033-46-9 Molecular Formula: C6H11NO4S Molecular Weight (g/mol): 193.217 MDL Number: MFCD03424208 InChI Key: FBPINGSGHKXIQA-BYPYZUCNSA-N Synonym: 3-[(2-Carboxyethyl)thio]alanine PubChem CID: 23618202 IUPAC Name: (2R)-2-amino-3-(2-carboxyethylsulfanyl)propanoic acid SMILES: C(CSCC(C(=O)O)N)C(=O)O
| PubChem CID | 23618202 |
|---|---|
| CAS | 4033-46-9 |
| Molecular Weight (g/mol) | 193.217 |
| MDL Number | MFCD03424208 |
| SMILES | C(CSCC(C(=O)O)N)C(=O)O |
| Synonym | 3-[(2-Carboxyethyl)thio]alanine |
| IUPAC Name | (2R)-2-amino-3-(2-carboxyethylsulfanyl)propanoic acid |
| InChI Key | FBPINGSGHKXIQA-BYPYZUCNSA-N |
| Molecular Formula | C6H11NO4S |
1,3-Diethynylbenzene 96.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 1785-61-1 Molecular Formula: C10H6 Molecular Weight (g/mol): 126.158 MDL Number: MFCD00041686 InChI Key: PNXLPYYXCOXPBM-UHFFFAOYSA-N PubChem CID: 123130 IUPAC Name: 1,3-diethynylbenzene SMILES: C#CC1=CC(=CC=C1)C#C
| PubChem CID | 123130 |
|---|---|
| CAS | 1785-61-1 |
| Molecular Weight (g/mol) | 126.158 |
| MDL Number | MFCD00041686 |
| SMILES | C#CC1=CC(=CC=C1)C#C |
| IUPAC Name | 1,3-diethynylbenzene |
| InChI Key | PNXLPYYXCOXPBM-UHFFFAOYSA-N |
| Molecular Formula | C10H6 |
4-tert-Butyl N-(tert-Butoxycarbonyl)-L-aspartate 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 1676-90-0 Molecular Formula: C13H23NO6 Molecular Weight (g/mol): 289.328 MDL Number: MFCD00076912 InChI Key: PHJDCONJXLIIPW-QMMMGPOBSA-N Synonym: boc-asp otbu-oh,boc-l-aspartic acid 4-tert-butyl ester,boc-asp obut-oh,s-4-tert-butoxy-2-tert-butoxycarbonyl amino-4-oxobutanoic acid,n-alpha-t-boc-l-aspartic acid beta-t-butyl ester,2s-4-tert-butoxy-2-tert-butoxycarbonyl amino-4-oxobutanoic acid,boc-asp but,pubchem12101,n-boc-asp o-t-bu oh PubChem CID: 7010636 IUPAC Name: (2S)-4-[(2-methylpropan-2-yl)oxy]-2-[(2-methylpropan-2-yl)oxycarbonylamino]-4-oxobutanoic acid SMILES: CC(C)(C)OC(=O)CC(C(=O)O)NC(=O)OC(C)(C)C
| PubChem CID | 7010636 |
|---|---|
| CAS | 1676-90-0 |
| Molecular Weight (g/mol) | 289.328 |
| MDL Number | MFCD00076912 |
| SMILES | CC(C)(C)OC(=O)CC(C(=O)O)NC(=O)OC(C)(C)C |
| Synonym | boc-asp otbu-oh,boc-l-aspartic acid 4-tert-butyl ester,boc-asp obut-oh,s-4-tert-butoxy-2-tert-butoxycarbonyl amino-4-oxobutanoic acid,n-alpha-t-boc-l-aspartic acid beta-t-butyl ester,2s-4-tert-butoxy-2-tert-butoxycarbonyl amino-4-oxobutanoic acid,boc-asp but,pubchem12101,n-boc-asp o-t-bu oh |
| IUPAC Name | (2S)-4-[(2-methylpropan-2-yl)oxy]-2-[(2-methylpropan-2-yl)oxycarbonylamino]-4-oxobutanoic acid |
| InChI Key | PHJDCONJXLIIPW-QMMMGPOBSA-N |
| Molecular Formula | C13H23NO6 |
2,4-Difluorobenzoyl Chloride 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 72482-64-5 Molecular Formula: C7H3ClF2O Molecular Weight (g/mol): 176.55 MDL Number: MFCD00000658 InChI Key: JSWRVDNTKPAJLB-UHFFFAOYSA-N Synonym: 2,4-difluorobenzoylchloride,benzoyl chloride, 2,4-difluoro,benzoyl chloride,2,4-difluoro,acmc-1bfet,2,4difluorobenzoylchloride,2,4-difluorobezoyl chloride,2,4 difluorobenzoyl chloride,2,4-difluoro benzoylchloride,2,4-difluoro-benzoylchloride,2,4-difluoro-benzoyl chloride PubChem CID: 588081 IUPAC Name: 2,4-difluorobenzoyl chloride SMILES: FC1=CC=C(C(Cl)=O)C(F)=C1
| PubChem CID | 588081 |
|---|---|
| CAS | 72482-64-5 |
| Molecular Weight (g/mol) | 176.55 |
| MDL Number | MFCD00000658 |
| SMILES | FC1=CC=C(C(Cl)=O)C(F)=C1 |
| Synonym | 2,4-difluorobenzoylchloride,benzoyl chloride, 2,4-difluoro,benzoyl chloride,2,4-difluoro,acmc-1bfet,2,4difluorobenzoylchloride,2,4-difluorobezoyl chloride,2,4 difluorobenzoyl chloride,2,4-difluoro benzoylchloride,2,4-difluoro-benzoylchloride,2,4-difluoro-benzoyl chloride |
| IUPAC Name | 2,4-difluorobenzoyl chloride |
| InChI Key | JSWRVDNTKPAJLB-UHFFFAOYSA-N |
| Molecular Formula | C7H3ClF2O |
Diethyl Maleate 90.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 141-05-9 Molecular Formula: C8H12O4 Molecular Weight (g/mol): 172.18 MDL Number: MFCD00009191 InChI Key: IEPRKVQEAMIZSS-WAYWQWQTSA-N Synonym: diethyl maleate,ethyl maleate,maleic acid, diethyl ester,diethylmaleate,maleic acid diethyl ester,2-butenedioic acid z-, diethyl ester,diethyl z-but-2-enedioate,diethyl 2z-but-2-enedioate,unii-g81wqb56ol,ccris 941 PubChem CID: 5271566 ChEBI: CHEBI:68508 IUPAC Name: diethyl (Z)-but-2-enedioate SMILES: CCOC(=O)C=CC(=O)OCC
| PubChem CID | 5271566 |
|---|---|
| CAS | 141-05-9 |
| Molecular Weight (g/mol) | 172.18 |
| ChEBI | CHEBI:68508 |
| MDL Number | MFCD00009191 |
| SMILES | CCOC(=O)C=CC(=O)OCC |
| Synonym | diethyl maleate,ethyl maleate,maleic acid, diethyl ester,diethylmaleate,maleic acid diethyl ester,2-butenedioic acid z-, diethyl ester,diethyl z-but-2-enedioate,diethyl 2z-but-2-enedioate,unii-g81wqb56ol,ccris 941 |
| IUPAC Name | diethyl (Z)-but-2-enedioate |
| InChI Key | IEPRKVQEAMIZSS-WAYWQWQTSA-N |
| Molecular Formula | C8H12O4 |
2-(Propylthio)ethanol 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 22812-90-4 Molecular Formula: C5H12OS Molecular Weight (g/mol): 120.21 MDL Number: MFCD00014041 InChI Key: KCWWXXYQPUDKBX-UHFFFAOYSA-N Synonym: 2-propylthio ethanol,2-hydroxyethyl propyl sulfide,2-n-propylthio ethanol,2-hydroxyethyl n-propyl sulfide,2-propylsulfanyl ethanol,2-propylthioethan-1-ol,acmc-209fyz,ethanol, 2-propylthio,2-propylsulfanyl ethanol #,2-hydroxyethyln-propylsulfide PubChem CID: 89850 IUPAC Name: 2-propylsulfanylethanol SMILES: CCCSCCO
| PubChem CID | 89850 |
|---|---|
| CAS | 22812-90-4 |
| Molecular Weight (g/mol) | 120.21 |
| MDL Number | MFCD00014041 |
| SMILES | CCCSCCO |
| Synonym | 2-propylthio ethanol,2-hydroxyethyl propyl sulfide,2-n-propylthio ethanol,2-hydroxyethyl n-propyl sulfide,2-propylsulfanyl ethanol,2-propylthioethan-1-ol,acmc-209fyz,ethanol, 2-propylthio,2-propylsulfanyl ethanol #,2-hydroxyethyln-propylsulfide |
| IUPAC Name | 2-propylsulfanylethanol |
| InChI Key | KCWWXXYQPUDKBX-UHFFFAOYSA-N |
| Molecular Formula | C5H12OS |
Phthalimidoacetaldehyde 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 2913-97-5 Molecular Formula: C10H7NO3 Molecular Weight (g/mol): 189.17 MDL Number: MFCD00023080 InChI Key: LMRDBJZQDUVCQH-UHFFFAOYSA-N Synonym: N-(Formylmethyl)phthalimide PubChem CID: 76201 IUPAC Name: 2-(1,3-dioxoisoindol-2-yl)acetaldehyde SMILES: C1=CC=C2C(=C1)C(=O)N(C2=O)CC=O
| PubChem CID | 76201 |
|---|---|
| CAS | 2913-97-5 |
| Molecular Weight (g/mol) | 189.17 |
| MDL Number | MFCD00023080 |
| SMILES | C1=CC=C2C(=C1)C(=O)N(C2=O)CC=O |
| Synonym | N-(Formylmethyl)phthalimide |
| IUPAC Name | 2-(1,3-dioxoisoindol-2-yl)acetaldehyde |
| InChI Key | LMRDBJZQDUVCQH-UHFFFAOYSA-N |
| Molecular Formula | C10H7NO3 |
N-(1-Pyrenyl)maleimide 97.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 42189-56-0 Molecular Formula: C20H11NO2 Molecular Weight (g/mol): 297.31 MDL Number: MFCD00049301 InChI Key: NPTUGEKDRBZJRE-UHFFFAOYSA-N Synonym: n-1-pyrenyl maleimide,n-1-pyrene maleimide,1-pyren-1-yl-1h-pyrrole-2,5-dione,n-3-pyrenyl maleimide,1-pyren-1-yl pyrrole-2,5-dione,n-1-pyrenyl-maleimide,acmc-209jo6,n-3-pyrene maleeimide,1h-pyrrole-2,5-dione,1-1-pyrenyl PubChem CID: 626783 IUPAC Name: 1-(pyren-4-yl)-2,5-dihydro-1H-pyrrole-2,5-dione SMILES: O=C1C=CC(=O)N1C1=CC2=CC=CC3=CC=C4C=CC=C1C4=C23
| PubChem CID | 626783 |
|---|---|
| CAS | 42189-56-0 |
| Molecular Weight (g/mol) | 297.31 |
| MDL Number | MFCD00049301 |
| SMILES | O=C1C=CC(=O)N1C1=CC2=CC=CC3=CC=C4C=CC=C1C4=C23 |
| Synonym | n-1-pyrenyl maleimide,n-1-pyrene maleimide,1-pyren-1-yl-1h-pyrrole-2,5-dione,n-3-pyrenyl maleimide,1-pyren-1-yl pyrrole-2,5-dione,n-1-pyrenyl-maleimide,acmc-209jo6,n-3-pyrene maleeimide,1h-pyrrole-2,5-dione,1-1-pyrenyl |
| IUPAC Name | 1-(pyren-4-yl)-2,5-dihydro-1H-pyrrole-2,5-dione |
| InChI Key | NPTUGEKDRBZJRE-UHFFFAOYSA-N |
| Molecular Formula | C20H11NO2 |
2,5-Dimethyl-7,7,8,8-tetracyanoquinodimethane 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 1487-82-7 Molecular Formula: C14H8N4 Molecular Weight (g/mol): 232.25 MDL Number: MFCD00130123 InChI Key: DFJXWQJAMNCPII-UHFFFAOYSA-N PubChem CID: 616047 IUPAC Name: 2-[4-(dicyanomethylidene)-2,5-dimethylcyclohexa-2,5-dien-1-ylidene]propanedinitrile SMILES: CC1=CC(=C(C#N)C#N)C(C)=CC1=C(C#N)C#N
| PubChem CID | 616047 |
|---|---|
| CAS | 1487-82-7 |
| Molecular Weight (g/mol) | 232.25 |
| MDL Number | MFCD00130123 |
| SMILES | CC1=CC(=C(C#N)C#N)C(C)=CC1=C(C#N)C#N |
| IUPAC Name | 2-[4-(dicyanomethylidene)-2,5-dimethylcyclohexa-2,5-dien-1-ylidene]propanedinitrile |
| InChI Key | DFJXWQJAMNCPII-UHFFFAOYSA-N |
| Molecular Formula | C14H8N4 |
Thioacetamide 98.0+%, TCI America™
Small and Specialty Supplier Partner
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
Small and/or specialty supplier based on Federal laws and SBA requirements.
Learn More
CAS: 62-55-5 Molecular Formula: C2H5NS Molecular Weight (g/mol): 75.13 MDL Number: MFCD00008070 InChI Key: YUKQRDCYNOVPGJ-UHFFFAOYSA-N Synonym: thioacetamide,acetothioamide,thiacetamide,acetamide, thio,thioacetimidic acid,acetimidic acid, thio,usaf cb-21,usaf ek-1719,rcra waste number u218,acetic acid, thiono-, amide PubChem CID: 2723949 ChEBI: CHEBI:32497 IUPAC Name: ethanethioamide SMILES: CC(N)=S
| PubChem CID | 2723949 |
|---|---|
| CAS | 62-55-5 |
| Molecular Weight (g/mol) | 75.13 |
| ChEBI | CHEBI:32497 |
| MDL Number | MFCD00008070 |
| SMILES | CC(N)=S |
| Synonym | thioacetamide,acetothioamide,thiacetamide,acetamide, thio,thioacetimidic acid,acetimidic acid, thio,usaf cb-21,usaf ek-1719,rcra waste number u218,acetic acid, thiono-, amide |
| IUPAC Name | ethanethioamide |
| InChI Key | YUKQRDCYNOVPGJ-UHFFFAOYSA-N |
| Molecular Formula | C2H5NS |