Organoheterocyclic compounds
Filtered Search Results
Xanthydrol, 98+%
CAS: 90-46-0 Molecular Formula: C13H10O2 Molecular Weight (g/mol): 198.221 MDL Number: MFCD00005057 InChI Key: JFRMYMMIJXLMBB-UHFFFAOYSA-N Synonym: 9-hydroxyxanthene,xanthydrol,xanthanol,9-xanthydrol,xanthen-9-ol,xanthene, hydroxy,9-xanthenol,ccris 1640,unii-7131m69ikf,xanthrol PubChem CID: 72861 IUPAC Name: 9H-xanthen-9-ol SMILES: C1=CC=C2C(=C1)C(C3=CC=CC=C3O2)O
| PubChem CID | 72861 |
|---|---|
| CAS | 90-46-0 |
| Molecular Weight (g/mol) | 198.221 |
| MDL Number | MFCD00005057 |
| SMILES | C1=CC=C2C(=C1)C(C3=CC=CC=C3O2)O |
| Synonym | 9-hydroxyxanthene,xanthydrol,xanthanol,9-xanthydrol,xanthen-9-ol,xanthene, hydroxy,9-xanthenol,ccris 1640,unii-7131m69ikf,xanthrol |
| IUPAC Name | 9H-xanthen-9-ol |
| InChI Key | JFRMYMMIJXLMBB-UHFFFAOYSA-N |
| Molecular Formula | C13H10O2 |
beta-Naphthoflavone, 98+%
CAS: 6051-87-2 Molecular Formula: C19H12O2 Molecular Weight (g/mol): 272.303 MDL Number: MFCD00004986 InChI Key: OUGIDAPQYNCXRA-UHFFFAOYSA-N Synonym: beta-naphthoflavone,5,6-benzoflavone,beta-nf,3-phenyl-1h-naphtho 2,1-b pyran-1-one,3-phenyl-1h-benzo f chromen-1-one,1h-naphtho 2,1-b pyran-1-one, 3-phenyl,unii-1bt0256y8o,3-phenylbenzo f chromen-1-one,ccris 3262,.beta.-naphthoflavone PubChem CID: 2361 ChEBI: CHEBI:77013 IUPAC Name: 3-phenylbenzo[f]chromen-1-one SMILES: C1=CC=C(C=C1)C2=CC(=O)C3=C(O2)C=CC4=CC=CC=C43
| PubChem CID | 2361 |
|---|---|
| CAS | 6051-87-2 |
| Molecular Weight (g/mol) | 272.303 |
| ChEBI | CHEBI:77013 |
| MDL Number | MFCD00004986 |
| SMILES | C1=CC=C(C=C1)C2=CC(=O)C3=C(O2)C=CC4=CC=CC=C43 |
| Synonym | beta-naphthoflavone,5,6-benzoflavone,beta-nf,3-phenyl-1h-naphtho 2,1-b pyran-1-one,3-phenyl-1h-benzo f chromen-1-one,1h-naphtho 2,1-b pyran-1-one, 3-phenyl,unii-1bt0256y8o,3-phenylbenzo f chromen-1-one,ccris 3262,.beta.-naphthoflavone |
| IUPAC Name | 3-phenylbenzo[f]chromen-1-one |
| InChI Key | OUGIDAPQYNCXRA-UHFFFAOYSA-N |
| Molecular Formula | C19H12O2 |
Benzyl nicotinate, 98%
CAS: 94-44-0 Molecular Formula: C13H11NO2 Molecular Weight (g/mol): 213.236 MDL Number: MFCD00023584 InChI Key: KVYGGMBOZFWZBQ-UHFFFAOYSA-N Synonym: benzyl nicotinate,nicotinic acid benzyl ester,rubriment,pycaril,pykaryl,niacin benzyl ester,3-pyridinecarboxylic acid, phenylmethyl ester,benzylis nicotinas,nicotinic acid, benzyl ester,nicotinsaeurebenzylester PubChem CID: 7191 ChEBI: CHEBI:31268 IUPAC Name: benzyl pyridine-3-carboxylate SMILES: C1=CC=C(C=C1)COC(=O)C2=CN=CC=C2
| PubChem CID | 7191 |
|---|---|
| CAS | 94-44-0 |
| Molecular Weight (g/mol) | 213.236 |
| ChEBI | CHEBI:31268 |
| MDL Number | MFCD00023584 |
| SMILES | C1=CC=C(C=C1)COC(=O)C2=CN=CC=C2 |
| Synonym | benzyl nicotinate,nicotinic acid benzyl ester,rubriment,pycaril,pykaryl,niacin benzyl ester,3-pyridinecarboxylic acid, phenylmethyl ester,benzylis nicotinas,nicotinic acid, benzyl ester,nicotinsaeurebenzylester |
| IUPAC Name | benzyl pyridine-3-carboxylate |
| InChI Key | KVYGGMBOZFWZBQ-UHFFFAOYSA-N |
| Molecular Formula | C13H11NO2 |
3-Amino-1H-pyrazole, 97+%
CAS: 1820-80-0 Molecular Formula: C3H5N3 Molecular Weight (g/mol): 83.094 MDL Number: MFCD00005236 InChI Key: JVVRJMXHNUAPHW-UHFFFAOYSA-N Synonym: 3-aminopyrazole,1h-pyrazol-3-amine,1h-pyrazole-5-amine,5-aminopyrazole,1h-pyrazol-3-ylamine,3-amino-1h-pyrazole,3-aminopyrozole,5-amino-1h-pyrazole,aminopyrazole,3-pyrazolamine PubChem CID: 74561 IUPAC Name: 1H-pyrazol-5-amine SMILES: C1=C(NN=C1)N
| PubChem CID | 74561 |
|---|---|
| CAS | 1820-80-0 |
| Molecular Weight (g/mol) | 83.094 |
| MDL Number | MFCD00005236 |
| SMILES | C1=C(NN=C1)N |
| Synonym | 3-aminopyrazole,1h-pyrazol-3-amine,1h-pyrazole-5-amine,5-aminopyrazole,1h-pyrazol-3-ylamine,3-amino-1h-pyrazole,3-aminopyrozole,5-amino-1h-pyrazole,aminopyrazole,3-pyrazolamine |
| IUPAC Name | 1H-pyrazol-5-amine |
| InChI Key | JVVRJMXHNUAPHW-UHFFFAOYSA-N |
| Molecular Formula | C3H5N3 |
gamma-Hexanolactone, 98%
CAS: 695-06-7 Molecular Formula: C6H10O2 Molecular Weight (g/mol): 114.14 MDL Number: MFCD00005401 InChI Key: JBFHTYHTHYHCDJ-UHFFFAOYNA-N Synonym: gamma-caprolactone,gamma-hexalactone,4-hexanolide,gamma-hexanolactone,6-caprolactone,tonkalide,toukalide,2 3h-furanone, 5-ethyldihydro,4-ethyl-4-butanolide,5-ethyldihydrofuran-2 3h-one PubChem CID: 12756 ChEBI: CHEBI:85235 IUPAC Name: 5-ethyloxolan-2-one SMILES: CCC1CCC(=O)O1
| PubChem CID | 12756 |
|---|---|
| CAS | 695-06-7 |
| Molecular Weight (g/mol) | 114.14 |
| ChEBI | CHEBI:85235 |
| MDL Number | MFCD00005401 |
| SMILES | CCC1CCC(=O)O1 |
| Synonym | gamma-caprolactone,gamma-hexalactone,4-hexanolide,gamma-hexanolactone,6-caprolactone,tonkalide,toukalide,2 3h-furanone, 5-ethyldihydro,4-ethyl-4-butanolide,5-ethyldihydrofuran-2 3h-one |
| IUPAC Name | 5-ethyloxolan-2-one |
| InChI Key | JBFHTYHTHYHCDJ-UHFFFAOYNA-N |
| Molecular Formula | C6H10O2 |
Ethyl picolinate, 99%
CAS: 2524-52-9 Molecular Formula: C8H9NO2 Molecular Weight (g/mol): 151.17 MDL Number: MFCD00006292 InChI Key: FQYYIPZPELSLDK-UHFFFAOYSA-N Synonym: ethyl picolinate,ethyl 2-picolinate,ethyl 2-pyridinecarboxylate,picolinic acid, ethyl ester,2-picolinic acid ethyl ester,2-pyridinecarboxylic acid, ethyl ester,2-ethoxycarbonyl pyridine,picolinic acid ethyl ester,2-pyridinecarboxylic acid ethyl ester,pyridine-2-carboxylic acid ethyl ester PubChem CID: 17307 IUPAC Name: ethyl pyridine-2-carboxylate SMILES: CCOC(=O)C1=CC=CC=N1
| PubChem CID | 17307 |
|---|---|
| CAS | 2524-52-9 |
| Molecular Weight (g/mol) | 151.17 |
| MDL Number | MFCD00006292 |
| SMILES | CCOC(=O)C1=CC=CC=N1 |
| Synonym | ethyl picolinate,ethyl 2-picolinate,ethyl 2-pyridinecarboxylate,picolinic acid, ethyl ester,2-picolinic acid ethyl ester,2-pyridinecarboxylic acid, ethyl ester,2-ethoxycarbonyl pyridine,picolinic acid ethyl ester,2-pyridinecarboxylic acid ethyl ester,pyridine-2-carboxylic acid ethyl ester |
| IUPAC Name | ethyl pyridine-2-carboxylate |
| InChI Key | FQYYIPZPELSLDK-UHFFFAOYSA-N |
| Molecular Formula | C8H9NO2 |
6-Bromopiperonal, 98%
CAS: 15930-53-7 Molecular Formula: C8H5BrO3 Molecular Weight (g/mol): 229.03 MDL Number: MFCD00022952 InChI Key: CSQUXTSIDQURDV-UHFFFAOYSA-N Synonym: 6-bromopiperonal,6-bromo-benzo 1,3 dioxole-5-carbaldehyde,2-bromo-4,5-methylenedioxybenzaldehyde,piperonal, 6-bromo,6-bromobenzo d 1,3 dioxole-5-carbaldehyde,6-bromo-1,3-benzodioxole-5-carboxaldehyde,6-bromo-2h-1,3-benzodioxole-5-carbaldehyde,1,3-benzodioxole-5-carboxaldehyde, 6-bromo,6-bromobenzo 1,3 dioxole-5-carbaldehyde,benzaldehyde, 2-bromo-4,5-methylenedioxy PubChem CID: 95062 SMILES: BrC1=CC2=C(OCO2)C=C1C=O
| PubChem CID | 95062 |
|---|---|
| CAS | 15930-53-7 |
| Molecular Weight (g/mol) | 229.03 |
| MDL Number | MFCD00022952 |
| SMILES | BrC1=CC2=C(OCO2)C=C1C=O |
| Synonym | 6-bromopiperonal,6-bromo-benzo 1,3 dioxole-5-carbaldehyde,2-bromo-4,5-methylenedioxybenzaldehyde,piperonal, 6-bromo,6-bromobenzo d 1,3 dioxole-5-carbaldehyde,6-bromo-1,3-benzodioxole-5-carboxaldehyde,6-bromo-2h-1,3-benzodioxole-5-carbaldehyde,1,3-benzodioxole-5-carboxaldehyde, 6-bromo,6-bromobenzo 1,3 dioxole-5-carbaldehyde,benzaldehyde, 2-bromo-4,5-methylenedioxy |
| InChI Key | CSQUXTSIDQURDV-UHFFFAOYSA-N |
| Molecular Formula | C8H5BrO3 |
2,7-Dimethylpyrazolo[1,5-a]pyrimidine-6-carboxylic acid, 97%
CAS: 175201-51-1 Molecular Formula: C9H9N3O2 Molecular Weight (g/mol): 191.19 MDL Number: MFCD00067901 InChI Key: CACYYYIWDACOAQ-UHFFFAOYSA-N Synonym: 2,7-dimethylpyrazolo 1,5-a pyrimidine-6-carboxylic acid,pyrazolo 1,5-a pyrimidine-6-carboxylic acid, 2,7-dimethyl,maybridge1_004672,6-carboxy-2,7-dimethylpyrazolo 1,5-a pyrimidine,pyrazolo 1,5-a pyrimidine-6-carboxylicacid, 2,7-dimethyl,2,7-dimethylpyrazolo 1,5-a pyrimidine-6-carboxylicacid,2,7-dimethyl-8-hydropyrazolo 1,5-a pyrimidine-6-carboxylic acid PubChem CID: 2736303 IUPAC Name: 2,7-dimethylpyrazolo[1,5-a]pyrimidine-6-carboxylic acid SMILES: CC1=NN2C(=C(C=NC2=C1)C(=O)O)C
| PubChem CID | 2736303 |
|---|---|
| CAS | 175201-51-1 |
| Molecular Weight (g/mol) | 191.19 |
| MDL Number | MFCD00067901 |
| SMILES | CC1=NN2C(=C(C=NC2=C1)C(=O)O)C |
| Synonym | 2,7-dimethylpyrazolo 1,5-a pyrimidine-6-carboxylic acid,pyrazolo 1,5-a pyrimidine-6-carboxylic acid, 2,7-dimethyl,maybridge1_004672,6-carboxy-2,7-dimethylpyrazolo 1,5-a pyrimidine,pyrazolo 1,5-a pyrimidine-6-carboxylicacid, 2,7-dimethyl,2,7-dimethylpyrazolo 1,5-a pyrimidine-6-carboxylicacid,2,7-dimethyl-8-hydropyrazolo 1,5-a pyrimidine-6-carboxylic acid |
| IUPAC Name | 2,7-dimethylpyrazolo[1,5-a]pyrimidine-6-carboxylic acid |
| InChI Key | CACYYYIWDACOAQ-UHFFFAOYSA-N |
| Molecular Formula | C9H9N3O2 |
5-Amino-1,3-diphenyl-1H-pyrazole, 97%
CAS: 5356-71-8 Molecular Formula: C15H13N3 Molecular Weight (g/mol): 235.29 MDL Number: MFCD00084878 InChI Key: SXOFMEWDEKEVJU-UHFFFAOYSA-N Synonym: 1,3-diphenyl-1h-pyrazol-5-amine,5-amino-1,3-diphenylpyrazole,1h-pyrazol-5-amine, 1,3-diphenyl,pyrazole, 5-amino-1,3-diphenyl,5-amino-1,3-diphenyl-1h-pyrazole,1,3-diphenyl-1h-pyrazol-5-ylamine,1,3-diphenylpyrazole-5-ylamine,maybridge1_004139,acmc-1apw6,cbmicro_003752 PubChem CID: 199969 IUPAC Name: 2,5-diphenylpyrazol-3-amine SMILES: C1=CC=C(C=C1)C2=NN(C(=C2)N)C3=CC=CC=C3
| PubChem CID | 199969 |
|---|---|
| CAS | 5356-71-8 |
| Molecular Weight (g/mol) | 235.29 |
| MDL Number | MFCD00084878 |
| SMILES | C1=CC=C(C=C1)C2=NN(C(=C2)N)C3=CC=CC=C3 |
| Synonym | 1,3-diphenyl-1h-pyrazol-5-amine,5-amino-1,3-diphenylpyrazole,1h-pyrazol-5-amine, 1,3-diphenyl,pyrazole, 5-amino-1,3-diphenyl,5-amino-1,3-diphenyl-1h-pyrazole,1,3-diphenyl-1h-pyrazol-5-ylamine,1,3-diphenylpyrazole-5-ylamine,maybridge1_004139,acmc-1apw6,cbmicro_003752 |
| IUPAC Name | 2,5-diphenylpyrazol-3-amine |
| InChI Key | SXOFMEWDEKEVJU-UHFFFAOYSA-N |
| Molecular Formula | C15H13N3 |
Xanthone, 99%
CAS: 90-47-1 Molecular Formula: C13H8O2 Molecular Weight (g/mol): 196.205 MDL Number: MFCD00005060 InChI Key: JNELGWHKGNBSMD-UHFFFAOYSA-N Synonym: xanthone,9h-xanthen-9-one,9-xanthenone,benzophenone oxide,9-oxoxanthene,genicide,xanthenone,9-xanthone,diphenylene ketone oxide,dibenzo-gamma-pyrone PubChem CID: 7020 ChEBI: CHEBI:37647 IUPAC Name: xanthen-9-one SMILES: C1=CC=C2C(=C1)C(=O)C3=CC=CC=C3O2
| PubChem CID | 7020 |
|---|---|
| CAS | 90-47-1 |
| Molecular Weight (g/mol) | 196.205 |
| ChEBI | CHEBI:37647 |
| MDL Number | MFCD00005060 |
| SMILES | C1=CC=C2C(=C1)C(=O)C3=CC=CC=C3O2 |
| Synonym | xanthone,9h-xanthen-9-one,9-xanthenone,benzophenone oxide,9-oxoxanthene,genicide,xanthenone,9-xanthone,diphenylene ketone oxide,dibenzo-gamma-pyrone |
| IUPAC Name | xanthen-9-one |
| InChI Key | JNELGWHKGNBSMD-UHFFFAOYSA-N |
| Molecular Formula | C13H8O2 |
3-(2-Furyl)acrylic acid, 99%
CAS: 539-47-9 Molecular Formula: C7H6O3 Molecular Weight (g/mol): 138.12 MDL Number: MFCD00003257,MFCD11656544 InChI Key: ZCJLOOJRNPHKAV-ONEGZZNKSA-N Synonym: 3-2-furyl acrylic acid,e-3-furan-2-yl acrylic acid,2-furanacrylic acid,3-furan-2-yl acrylic acid,furanacrylic acid,2-furalacetic acid,furacrylic acid,furylacrylic acid,2e-3-furan-2-yl prop-2-enoic acid,2-propenoic acid, 3-2-furanyl PubChem CID: 643402 SMILES: OC(=O)\C=C\C1=CC=CO1
| PubChem CID | 643402 |
|---|---|
| CAS | 539-47-9 |
| Molecular Weight (g/mol) | 138.12 |
| MDL Number | MFCD00003257,MFCD11656544 |
| SMILES | OC(=O)\C=C\C1=CC=CO1 |
| Synonym | 3-2-furyl acrylic acid,e-3-furan-2-yl acrylic acid,2-furanacrylic acid,3-furan-2-yl acrylic acid,furanacrylic acid,2-furalacetic acid,furacrylic acid,furylacrylic acid,2e-3-furan-2-yl prop-2-enoic acid,2-propenoic acid, 3-2-furanyl |
| InChI Key | ZCJLOOJRNPHKAV-ONEGZZNKSA-N |
| Molecular Formula | C7H6O3 |
Methyl 2-furoate, 98+%
CAS: 611-13-2 Molecular Formula: C6H6O3 Molecular Weight (g/mol): 126.111 MDL Number: MFCD00003236 InChI Key: HDJLSECJEQSPKW-UHFFFAOYSA-N Synonym: methyl 2-furoate,methyl pyromucate,methyl 2-furancarboxylate,methyl furoate,2-furancarboxylic acid, methyl ester,2-methoxycarbonyl furan,pyromucic acid methyl ester,methyl 2-furylcarboxylate,2-furoic acid, methyl ester,furoic acid, methyl ester PubChem CID: 11902 IUPAC Name: methyl furan-2-carboxylate SMILES: COC(=O)C1=CC=CO1
| PubChem CID | 11902 |
|---|---|
| CAS | 611-13-2 |
| Molecular Weight (g/mol) | 126.111 |
| MDL Number | MFCD00003236 |
| SMILES | COC(=O)C1=CC=CO1 |
| Synonym | methyl 2-furoate,methyl pyromucate,methyl 2-furancarboxylate,methyl furoate,2-furancarboxylic acid, methyl ester,2-methoxycarbonyl furan,pyromucic acid methyl ester,methyl 2-furylcarboxylate,2-furoic acid, methyl ester,furoic acid, methyl ester |
| IUPAC Name | methyl furan-2-carboxylate |
| InChI Key | HDJLSECJEQSPKW-UHFFFAOYSA-N |
| Molecular Formula | C6H6O3 |
1-Phenyl-1H-pyrazole, 98%
CAS: 1126-00-7 Molecular Formula: C9H8N2 Molecular Weight (g/mol): 144.18 MDL Number: MFCD00003112 InChI Key: WITMXBRCQWOZPX-UHFFFAOYSA-N Synonym: 1-phenyl-1h-pyrazole,n-phenylpyrazole,1h-pyrazole, 1-phenyl,pyrazole, 1-phenyl,1-phenylpyrazol,n-phenyl pyrazole,1-phenyl pyrazole,1-phenyl-pyrazole,1-phenyl-1h-pyrazol,l-phenyl-1h-pyrazole PubChem CID: 70769 ChEBI: CHEBI:38879 IUPAC Name: 1-phenylpyrazole SMILES: C1=CN(N=C1)C1=CC=CC=C1
| PubChem CID | 70769 |
|---|---|
| CAS | 1126-00-7 |
| Molecular Weight (g/mol) | 144.18 |
| ChEBI | CHEBI:38879 |
| MDL Number | MFCD00003112 |
| SMILES | C1=CN(N=C1)C1=CC=CC=C1 |
| Synonym | 1-phenyl-1h-pyrazole,n-phenylpyrazole,1h-pyrazole, 1-phenyl,pyrazole, 1-phenyl,1-phenylpyrazol,n-phenyl pyrazole,1-phenyl pyrazole,1-phenyl-pyrazole,1-phenyl-1h-pyrazol,l-phenyl-1h-pyrazole |
| IUPAC Name | 1-phenylpyrazole |
| InChI Key | WITMXBRCQWOZPX-UHFFFAOYSA-N |
| Molecular Formula | C9H8N2 |
Pyrido[2,3-b]pyrazine, 98%
CAS: 322-46-3 Molecular Formula: C7H5N3 Molecular Weight (g/mol): 131.14 MDL Number: MFCD00006717 InChI Key: YEYHFKBVNARCNE-UHFFFAOYSA-N Synonym: pyrido 2,3-b pyrazine,1,4,5-triazanaphthalene,5-azaquinoxaline,pyrido 2,3 pyrazine,pyrido 3,2-b pyrazine,acmc-20ahgw,1,5-triazanaphthalene,pyridino 2,3-b pyrazine PubChem CID: 67580 IUPAC Name: pyrido[2,3-b]pyrazine SMILES: C1=CN=C2N=CC=NC2=C1
| PubChem CID | 67580 |
|---|---|
| CAS | 322-46-3 |
| Molecular Weight (g/mol) | 131.14 |
| MDL Number | MFCD00006717 |
| SMILES | C1=CN=C2N=CC=NC2=C1 |
| Synonym | pyrido 2,3-b pyrazine,1,4,5-triazanaphthalene,5-azaquinoxaline,pyrido 2,3 pyrazine,pyrido 3,2-b pyrazine,acmc-20ahgw,1,5-triazanaphthalene,pyridino 2,3-b pyrazine |
| IUPAC Name | pyrido[2,3-b]pyrazine |
| InChI Key | YEYHFKBVNARCNE-UHFFFAOYSA-N |
| Molecular Formula | C7H5N3 |
Di-2-pyridyl thionocarbonate, 98%
CAS: 96989-50-3 Molecular Formula: C11H8N2O2S Molecular Weight (g/mol): 232.257 MDL Number: MFCD00074870 InChI Key: IKYOVSVBLHGFMA-UHFFFAOYSA-N Synonym: di-2-pyridyl thionocarbonate,o,o-di pyridin-2-yl carbonothioate,o,o'-di-2-pyridyl thiocarbonate,o,o-dipyridin-2-yl carbonothioate,di 2-pyridyl thionocarbonate,carbonothioic acid, o,o-di-2-pyridinyl ester,di 2-pyridyloxy methane-1-thione,o,o-dipyridin-2-yl thiocarbonate,bis pyridin-2-yloxy methanethione,di-2-pyridyl thiocarbomate PubChem CID: 719784 IUPAC Name: dipyridin-2-yloxymethanethione SMILES: C1=CC=NC(=C1)OC(=S)OC2=CC=CC=N2
| PubChem CID | 719784 |
|---|---|
| CAS | 96989-50-3 |
| Molecular Weight (g/mol) | 232.257 |
| MDL Number | MFCD00074870 |
| SMILES | C1=CC=NC(=C1)OC(=S)OC2=CC=CC=N2 |
| Synonym | di-2-pyridyl thionocarbonate,o,o-di pyridin-2-yl carbonothioate,o,o'-di-2-pyridyl thiocarbonate,o,o-dipyridin-2-yl carbonothioate,di 2-pyridyl thionocarbonate,carbonothioic acid, o,o-di-2-pyridinyl ester,di 2-pyridyloxy methane-1-thione,o,o-dipyridin-2-yl thiocarbonate,bis pyridin-2-yloxy methanethione,di-2-pyridyl thiocarbomate |
| IUPAC Name | dipyridin-2-yloxymethanethione |
| InChI Key | IKYOVSVBLHGFMA-UHFFFAOYSA-N |
| Molecular Formula | C11H8N2O2S |