Organic carbonic acids and derivatives
- (1)
- (5)
- (23)
- (12)
- (1)
- (1)
- (8)
- (3)
- (1)
- (2)
- (1)
- (29)
- (8)
- (3)
- (3)
- (1)
- (1)
- (1)
- (2)
- (9)
- (2)
- (2)
- (3)
- (70)
- (1)
- (5)
- (1)
- (13)
- (1)
- (2)
- (4)
- (1)
- (3)
- (49)
- (13)
- (2)
- (2)
- (6)
- (3)
- (43)
- (5)
- (1)
- (1)
- (2)
- (1)
- (4)
- (10)
- (3)
- (2)
- (1)
- (4)
- (4)
- (1)
- (2)
- (7)
- (8)
- (1)
- (14)
- (4)
- (2)
- (1)
- (2)
- (6)
- (2)
- (2)
- (6)
- (3)
- (4)
- (2)
- (3)
- (1)
- (4)
- (2)
- (3)
- (2)
- (3)
- (4)
- (2)
- (2)
- (2)
- (2)
- (2)
- (2)
- (4)
- (3)
- (2)
- (1)
- (2)
- (1)
- (2)
- (1)
- (1)
- (2)
- (2)
- (2)
- (2)
- (1)
- (3)
- (4)
- (1)
- (2)
- (2)
- (2)
- (2)
- (2)
- (2)
- (1)
- (5)
- (1)
- (2)
- (1)
- (2)
- (1)
- (2)
- (5)
- (3)
- (1)
- (4)
- (1)
- (1)
- (4)
- (40)
- (19)
- (2)
- (2)
- (2)
- (4)
- (6)
- (3)
- (5)
- (18)
- (11)
- (6)
- (2)
- (3)
- (2)
- (4)
- (2)
- (2)
- (1)
- (1)
- (1)
- (3)
- (2)
- (1)
- (3)
- (2)
- (8)
- (53)
- (2)
- (2)
- (8)
- (8)
- (11)
- (10)
- (6)
- (5)
- (2)
- (4)
- (3)
- (2)
- (10)
- (3)
- (2)
- (26)
- (50)
- (3)
- (3)
- (36)
- (5)
- (11)
- (2)
- (10)
- (8)
- (3)
- (2)
- (83)
- (2)
- (2)
- (3)
- (5)
- (4)
- (6)
- (86)
- (3)
- (8)
- (1)
- (19)
- (3)
- (3)
- (2)
- (2)
- (2)
- (4)
- (2)
- (3)
- (2)
- (2)
- (2)
- (2)
- (3)
- (6)
- (2)
- (4)
- (4)
- (1)
- (2)
- (3)
- (3)
- (1)
- (3)
- (2)
- (3)
- (2)
- (2)
- (3)
- (3)
- (2)
- (2)
- (2)
- (2)
- (2)
- (2)
- (1)
- (2)
- (2)
- (6)
- (1)
- (2)
- (2)
- (3)
- (2)
- (3)
- (3)
- (2)
- (3)
- (2)
- (2)
- (2)
- (2)
- (6)
- (5)
- (5)
Filtered Search Results
Urea (Certified ACS), Fisher Chemical™
CAS: 57-13-6 Molecular Formula: CH4N2O Molecular Weight (g/mol): 60.056 MDL Number: MFCD00008022 InChI Key: XSQUKJJJFZCRTK-UHFFFAOYSA-N Synonym: carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate PubChem CID: 1176 ChEBI: CHEBI:48376 IUPAC Name: urea SMILES: C(=O)(N)N
| PubChem CID | 1176 |
|---|---|
| CAS | 57-13-6 |
| Molecular Weight (g/mol) | 60.056 |
| ChEBI | CHEBI:48376 |
| MDL Number | MFCD00008022 |
| SMILES | C(=O)(N)N |
| Synonym | carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate |
| IUPAC Name | urea |
| InChI Key | XSQUKJJJFZCRTK-UHFFFAOYSA-N |
| Molecular Formula | CH4N2O |
Urea (USP), Fisher Chemical™
CAS: 57-13-6 Molecular Formula: CH4N2O Molecular Weight (g/mol): 60.056 MDL Number: MFCD00008022 InChI Key: XSQUKJJJFZCRTK-UHFFFAOYSA-N Synonym: carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate PubChem CID: 1176 ChEBI: CHEBI:48376 IUPAC Name: urea SMILES: C(=O)(N)N
| PubChem CID | 1176 |
|---|---|
| CAS | 57-13-6 |
| Molecular Weight (g/mol) | 60.056 |
| ChEBI | CHEBI:48376 |
| MDL Number | MFCD00008022 |
| SMILES | C(=O)(N)N |
| Synonym | carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate |
| IUPAC Name | urea |
| InChI Key | XSQUKJJJFZCRTK-UHFFFAOYSA-N |
| Molecular Formula | CH4N2O |
Urea (Colorless-to-White Crystals or Crystalline Powder/Mol. Biol.), Fisher BioReagents™
CAS: 57-13-6 Molecular Formula: CH4N2O Molecular Weight (g/mol): 60.056 InChI Key: XSQUKJJJFZCRTK-UHFFFAOYSA-N Synonym: carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate PubChem CID: 1176 ChEBI: CHEBI:48376 IUPAC Name: urea SMILES: C(=O)(N)N
| PubChem CID | 1176 |
|---|---|
| CAS | 57-13-6 |
| Molecular Weight (g/mol) | 60.056 |
| ChEBI | CHEBI:48376 |
| SMILES | C(=O)(N)N |
| Synonym | carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate |
| IUPAC Name | urea |
| InChI Key | XSQUKJJJFZCRTK-UHFFFAOYSA-N |
| Molecular Formula | CH4N2O |
1,1,3,3-Tetramethylurea, 99%
CAS: 632-22-4 Molecular Formula: C5H12N2O Molecular Weight (g/mol): 116.16 MDL Number: MFCD00008319 InChI Key: AVQQQNCBBIEMEU-UHFFFAOYSA-N Synonym: tetramethylurea,temur,urea, tetramethyl,n,n,n',n'-tetramethylurea,tetramethyluree,tmu,urea, 1,1,3,3-tetramethyl,urea, n,n,n',n'-tetramethyl,tetramethyluree french,tetramethyl-urea PubChem CID: 12437 ChEBI: CHEBI:84278 IUPAC Name: 1,1,3,3-tetramethylurea SMILES: CN(C)C(=O)N(C)C
| PubChem CID | 12437 |
|---|---|
| CAS | 632-22-4 |
| Molecular Weight (g/mol) | 116.16 |
| ChEBI | CHEBI:84278 |
| MDL Number | MFCD00008319 |
| SMILES | CN(C)C(=O)N(C)C |
| Synonym | tetramethylurea,temur,urea, tetramethyl,n,n,n',n'-tetramethylurea,tetramethyluree,tmu,urea, 1,1,3,3-tetramethyl,urea, n,n,n',n'-tetramethyl,tetramethyluree french,tetramethyl-urea |
| IUPAC Name | 1,1,3,3-tetramethylurea |
| InChI Key | AVQQQNCBBIEMEU-UHFFFAOYSA-N |
| Molecular Formula | C5H12N2O |
1-Methyl-2-benzimidazolinone, 98%
CAS: 1849-01-0 Molecular Formula: C8H8N2O Molecular Weight (g/mol): 148.17 MDL Number: MFCD00142654 InChI Key: PYEHNKXDXBNHQQ-UHFFFAOYSA-N Synonym: 1-methyl-2-benzimidazolinone,1-methyl-1h-benzo d imidazol-2 3h-one,1-methyl-1,3-dihydro-2h-benzimidazol-2-one,1,3-dihydro-1-methyl-2h-benzimidazol-2-one,2h-benzimidazol-2-one, 1,3-dihydro-1-methyl,1-methyl-2,3-dihydro-1h-1,3-benzodiazol-2-one,1-methyl-3h-1,3-benzodiazol-2-one,n-methylbenzimidazolone,1-methylbenzimidazolone,n-methylbenzimidazolinone PubChem CID: 590540 IUPAC Name: 3-methyl-1H-benzimidazol-2-one SMILES: CN1C(=O)NC2=CC=CC=C12
| PubChem CID | 590540 |
|---|---|
| CAS | 1849-01-0 |
| Molecular Weight (g/mol) | 148.17 |
| MDL Number | MFCD00142654 |
| SMILES | CN1C(=O)NC2=CC=CC=C12 |
| Synonym | 1-methyl-2-benzimidazolinone,1-methyl-1h-benzo d imidazol-2 3h-one,1-methyl-1,3-dihydro-2h-benzimidazol-2-one,1,3-dihydro-1-methyl-2h-benzimidazol-2-one,2h-benzimidazol-2-one, 1,3-dihydro-1-methyl,1-methyl-2,3-dihydro-1h-1,3-benzodiazol-2-one,1-methyl-3h-1,3-benzodiazol-2-one,n-methylbenzimidazolone,1-methylbenzimidazolone,n-methylbenzimidazolinone |
| IUPAC Name | 3-methyl-1H-benzimidazol-2-one |
| InChI Key | PYEHNKXDXBNHQQ-UHFFFAOYSA-N |
| Molecular Formula | C8H8N2O |
Cyclohexylurea, 98%
CAS: 698-90-8 Molecular Formula: C7H14N2O Molecular Weight (g/mol): 142.202 MDL Number: MFCD00014286 InChI Key: WUESWDIHTKHGQA-UHFFFAOYSA-N Synonym: 1-cyclohexylurea,urea, cyclohexyl,n-cyclohexylurea,n-cyclohexlurea,cyclohexyl urea,amino-n-cyclohexylamide,cyclohexyl-urea,monocyclohexylurea,n'-cyclohexylurea,n'-cyclohexyl urea PubChem CID: 69684 IUPAC Name: cyclohexylurea SMILES: C1CCC(CC1)NC(=O)N
| PubChem CID | 69684 |
|---|---|
| CAS | 698-90-8 |
| Molecular Weight (g/mol) | 142.202 |
| MDL Number | MFCD00014286 |
| SMILES | C1CCC(CC1)NC(=O)N |
| Synonym | 1-cyclohexylurea,urea, cyclohexyl,n-cyclohexylurea,n-cyclohexlurea,cyclohexyl urea,amino-n-cyclohexylamide,cyclohexyl-urea,monocyclohexylurea,n'-cyclohexylurea,n'-cyclohexyl urea |
| IUPAC Name | cyclohexylurea |
| InChI Key | WUESWDIHTKHGQA-UHFFFAOYSA-N |
| Molecular Formula | C7H14N2O |
4-Fluoro-1,3-dioxolan-2-one, 98%
CAS: 114435-02-8 Molecular Formula: C3H3FO3 Molecular Weight (g/mol): 106.052 MDL Number: MFCD06247543 InChI Key: SBLRHMKNNHXPHG-UHFFFAOYSA-N Synonym: fluoroethylene carbonate,1,3-dioxolan-2-one, 4-fluoro,fluoro ethylene carbonate,4-fluoro-1,3-dioxalan-2-one,4-fluoro-2-oxo-1,3-dioxolane,4-fluoro-ethylene carbonate,4-fluoro-ethylene carboante,ksc219e1h,fec, lithium ion battery grade PubChem CID: 2769656 IUPAC Name: 4-fluoro-1,3-dioxolan-2-one SMILES: C1C(OC(=O)O1)F
| PubChem CID | 2769656 |
|---|---|
| CAS | 114435-02-8 |
| Molecular Weight (g/mol) | 106.052 |
| MDL Number | MFCD06247543 |
| SMILES | C1C(OC(=O)O1)F |
| Synonym | fluoroethylene carbonate,1,3-dioxolan-2-one, 4-fluoro,fluoro ethylene carbonate,4-fluoro-1,3-dioxalan-2-one,4-fluoro-2-oxo-1,3-dioxolane,4-fluoro-ethylene carbonate,4-fluoro-ethylene carboante,ksc219e1h,fec, lithium ion battery grade |
| IUPAC Name | 4-fluoro-1,3-dioxolan-2-one |
| InChI Key | SBLRHMKNNHXPHG-UHFFFAOYSA-N |
| Molecular Formula | C3H3FO3 |
Triphosgene, 98%
CAS: 32315-10-9 Molecular Formula: C3Cl6O3 Molecular Weight (g/mol): 296.73 MDL Number: MFCD00062848 InChI Key: UCPYLLCMEDAXFR-UHFFFAOYSA-N Synonym: triphosgene,bis trichloromethyl carbonate,methanol, trichloro-, carbonate 2:1,ditrichloromethyl carbonate,triphosgene bis-trichloromethyl carbonate,methanol, 1,1,1-trichloro-, 1,1'-carbonate,triphosgen,tri phosgene,tri-phosgene PubChem CID: 94429 IUPAC Name: bis(trichloromethyl) carbonate SMILES: C(=O)(OC(Cl)(Cl)Cl)OC(Cl)(Cl)Cl
| PubChem CID | 94429 |
|---|---|
| CAS | 32315-10-9 |
| Molecular Weight (g/mol) | 296.73 |
| MDL Number | MFCD00062848 |
| SMILES | C(=O)(OC(Cl)(Cl)Cl)OC(Cl)(Cl)Cl |
| Synonym | triphosgene,bis trichloromethyl carbonate,methanol, trichloro-, carbonate 2:1,ditrichloromethyl carbonate,triphosgene bis-trichloromethyl carbonate,methanol, 1,1,1-trichloro-, 1,1'-carbonate,triphosgen,tri phosgene,tri-phosgene |
| IUPAC Name | bis(trichloromethyl) carbonate |
| InChI Key | UCPYLLCMEDAXFR-UHFFFAOYSA-N |
| Molecular Formula | C3Cl6O3 |
Methylurea, 97%
CAS: 598-50-5 Molecular Formula: C2H6N2O Molecular Weight (g/mol): 74.08 MDL Number: MFCD00007950 InChI Key: XGEGHDBEHXKFPX-UHFFFAOYSA-N Synonym: 1-methylurea,n-methylurea,monomethylurea,urea, methyl,methyl urea,urea, n-methyl,methylmocovina,methylmocovina czech,methylharnstoff german,n-methyl urea PubChem CID: 11719 ChEBI: CHEBI:44383 IUPAC Name: methylurea SMILES: CNC(=O)N
| PubChem CID | 11719 |
|---|---|
| CAS | 598-50-5 |
| Molecular Weight (g/mol) | 74.08 |
| ChEBI | CHEBI:44383 |
| MDL Number | MFCD00007950 |
| SMILES | CNC(=O)N |
| Synonym | 1-methylurea,n-methylurea,monomethylurea,urea, methyl,methyl urea,urea, n-methyl,methylmocovina,methylmocovina czech,methylharnstoff german,n-methyl urea |
| IUPAC Name | methylurea |
| InChI Key | XGEGHDBEHXKFPX-UHFFFAOYSA-N |
| Molecular Formula | C2H6N2O |
6-Bromoquinazoline-2,4(1H,3H)-dione, 97%
CAS: 88145-89-5 Molecular Formula: C8H5BrN2O2 Molecular Weight (g/mol): 241.044 MDL Number: MFCD00462868 InChI Key: JZDVFUAHGLJVQG-UHFFFAOYSA-N Synonym: 6-bromoquinazoline-2,4 1h,3h-dione,6-bromo-2,4 1h,3h-quinazolinedione,6-bromoquinazoline-2,4-dione,6-bromoquinazoline-2,4-diol,2,4 1h,3h-quinazolinedione, 6-bromo,6-bromo-1,3-dihydroquinazoline-2,4-dione,6-bromo-1,2,3,4-tetrahydroquinazoline-2,4-dione,bromoquinazolinedione,pubchem20961,acmc-209qre PubChem CID: 617686 IUPAC Name: 6-bromo-1H-quinazoline-2,4-dione SMILES: C1=CC2=C(C=C1Br)C(=O)NC(=O)N2
| PubChem CID | 617686 |
|---|---|
| CAS | 88145-89-5 |
| Molecular Weight (g/mol) | 241.044 |
| MDL Number | MFCD00462868 |
| SMILES | C1=CC2=C(C=C1Br)C(=O)NC(=O)N2 |
| Synonym | 6-bromoquinazoline-2,4 1h,3h-dione,6-bromo-2,4 1h,3h-quinazolinedione,6-bromoquinazoline-2,4-dione,6-bromoquinazoline-2,4-diol,2,4 1h,3h-quinazolinedione, 6-bromo,6-bromo-1,3-dihydroquinazoline-2,4-dione,6-bromo-1,2,3,4-tetrahydroquinazoline-2,4-dione,bromoquinazolinedione,pubchem20961,acmc-209qre |
| IUPAC Name | 6-bromo-1H-quinazoline-2,4-dione |
| InChI Key | JZDVFUAHGLJVQG-UHFFFAOYSA-N |
| Molecular Formula | C8H5BrN2O2 |
N,N'-Dimethylurea, 98%
CAS: 96-31-1 Molecular Formula: C3H8N2O Molecular Weight (g/mol): 88.11 MDL Number: MFCD00008286 InChI Key: MGJKQDOBUOMPEZ-UHFFFAOYSA-N Synonym: n,n'-dimethylurea,sym-dimethylurea,urea, n,n'-dimethyl,dimethylurea,symmetric dimethylurea,urea, 1,3-dimethyl,n,n'-dimethylharnstoff,1,3-dimethyl urea,n,n'-dimethylharnstoff german,unii-wam6dr9i4x PubChem CID: 7293 ChEBI: CHEBI:80472 IUPAC Name: 1,3-dimethylurea SMILES: CNC(=O)NC
| PubChem CID | 7293 |
|---|---|
| CAS | 96-31-1 |
| Molecular Weight (g/mol) | 88.11 |
| ChEBI | CHEBI:80472 |
| MDL Number | MFCD00008286 |
| SMILES | CNC(=O)NC |
| Synonym | n,n'-dimethylurea,sym-dimethylurea,urea, n,n'-dimethyl,dimethylurea,symmetric dimethylurea,urea, 1,3-dimethyl,n,n'-dimethylharnstoff,1,3-dimethyl urea,n,n'-dimethylharnstoff german,unii-wam6dr9i4x |
| IUPAC Name | 1,3-dimethylurea |
| InChI Key | MGJKQDOBUOMPEZ-UHFFFAOYSA-N |
| Molecular Formula | C3H8N2O |
Urea hydrogen peroxide, 1 g tablets, stabilized, contains 35 wt% H2O2
CAS: 124-43-6 Molecular Formula: CH6N2O3 Molecular Weight (g/mol): 94.07 InChI Key: AQLJVWUFPCUVLO-UHFFFAOYSA-N Synonym: urea hydrogen peroxide,carbamide peroxide,percarbamide,urea peroxide,urea dioxide,hydrogen peroxide urea,urea hydroperoxide,hydroperit,hydroperite,percarbamid PubChem CID: 31294 ChEBI: CHEBI:75178 IUPAC Name: hydrogen peroxide;urea SMILES: C(=O)(N)N.OO
| PubChem CID | 31294 |
|---|---|
| CAS | 124-43-6 |
| Molecular Weight (g/mol) | 94.07 |
| ChEBI | CHEBI:75178 |
| SMILES | C(=O)(N)N.OO |
| Synonym | urea hydrogen peroxide,carbamide peroxide,percarbamide,urea peroxide,urea dioxide,hydrogen peroxide urea,urea hydroperoxide,hydroperit,hydroperite,percarbamid |
| IUPAC Name | hydrogen peroxide;urea |
| InChI Key | AQLJVWUFPCUVLO-UHFFFAOYSA-N |
| Molecular Formula | CH6N2O3 |
4-Vinyl-1,3-dioxolan-2-one, 99%
CAS: 4427-96-7 Molecular Formula: C5H6O3 Molecular Weight (g/mol): 114.1 MDL Number: MFCD00143315 InChI Key: BJWMSGRKJIOCNR-UHFFFAOYSA-N Synonym: 4-vinyl-1,3-dioxolan-2-one,vinylethylene carbonate,4-vinyl-1,3-dioxolan-2-one, stabilized with hydroquinone,1,3-dioxolan-2-one, 4-ethenyl,acmc-1ajgp,vec;,ksc383e5n,2-oxo-4-vinyl-1,3-dioxolane,4-vinyl-1,3 dioxolan-2-one,4-vinyl-1,3-dioxaolane-2-one PubChem CID: 2735038 IUPAC Name: 4-ethenyl-1,3-dioxolan-2-one SMILES: C=CC1COC(=O)O1
| PubChem CID | 2735038 |
|---|---|
| CAS | 4427-96-7 |
| Molecular Weight (g/mol) | 114.1 |
| MDL Number | MFCD00143315 |
| SMILES | C=CC1COC(=O)O1 |
| Synonym | 4-vinyl-1,3-dioxolan-2-one,vinylethylene carbonate,4-vinyl-1,3-dioxolan-2-one, stabilized with hydroquinone,1,3-dioxolan-2-one, 4-ethenyl,acmc-1ajgp,vec;,ksc383e5n,2-oxo-4-vinyl-1,3-dioxolane,4-vinyl-1,3 dioxolan-2-one,4-vinyl-1,3-dioxaolane-2-one |
| IUPAC Name | 4-ethenyl-1,3-dioxolan-2-one |
| InChI Key | BJWMSGRKJIOCNR-UHFFFAOYSA-N |
| Molecular Formula | C5H6O3 |
Urea, ACS, 99.0-100.5%
CAS: 57-13-6 Molecular Formula: CH4N2O Molecular Weight (g/mol): 60.056 MDL Number: MFCD00008022 InChI Key: XSQUKJJJFZCRTK-UHFFFAOYSA-N Synonym: carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate PubChem CID: 1176 ChEBI: CHEBI:48376 IUPAC Name: urea SMILES: C(=O)(N)N
| PubChem CID | 1176 |
|---|---|
| CAS | 57-13-6 |
| Molecular Weight (g/mol) | 60.056 |
| ChEBI | CHEBI:48376 |
| MDL Number | MFCD00008022 |
| SMILES | C(=O)(N)N |
| Synonym | carbamide,isourea,carbonyldiamide,ureophil,carbonyldiamine,carbamimidic acid,pseudourea,ureaphil,urevert,alphadrate |
| IUPAC Name | urea |
| InChI Key | XSQUKJJJFZCRTK-UHFFFAOYSA-N |
| Molecular Formula | CH4N2O |
2-Hydroxybenzimidazole, 97%
CAS: 615-16-7 Molecular Formula: C7H6N2O Molecular Weight (g/mol): 134.14 MDL Number: MFCD00127894 InChI Key: SILNNFMWIMZVEQ-UHFFFAOYSA-N Synonym: 2-hydroxybenzimidazole,2-benzimidazolol,2-benzimidazolinone,o-phenyleneurea,2-benzimidazolone,2-oxobenzimidazole,2 3h-benzimidazolone,1,3-dihydro-2h-benzimidazol-2-one,2h-benzimidazol-2-one, 1,3-dihydro,benzamidazole-2 3h-one PubChem CID: 11985 IUPAC Name: 1,3-dihydrobenzimidazol-2-one SMILES: O=C1NC2=CC=CC=C2N1
| PubChem CID | 11985 |
|---|---|
| CAS | 615-16-7 |
| Molecular Weight (g/mol) | 134.14 |
| MDL Number | MFCD00127894 |
| SMILES | O=C1NC2=CC=CC=C2N1 |
| Synonym | 2-hydroxybenzimidazole,2-benzimidazolol,2-benzimidazolinone,o-phenyleneurea,2-benzimidazolone,2-oxobenzimidazole,2 3h-benzimidazolone,1,3-dihydro-2h-benzimidazol-2-one,2h-benzimidazol-2-one, 1,3-dihydro,benzamidazole-2 3h-one |
| IUPAC Name | 1,3-dihydrobenzimidazol-2-one |
| InChI Key | SILNNFMWIMZVEQ-UHFFFAOYSA-N |
| Molecular Formula | C7H6N2O |