Molecular formula
C21H18N4O3
171 compounds have this formula on CompoundList.
- Molar mass
- 374.40g/mol
- Monoisotopic mass
- 374.1379Da
- Atoms
- 46
- Elements
- 4
- Rings plus double bonds
- 15
The formula C21H18N4O3 describes a molecule made of 21 carbon atoms, 18 hydrogen atoms, 4 nitrogen atoms and 3 oxygen atoms. It is written in Hill notation: carbon first, then hydrogen, then the other elements in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.
Elemental composition
- C Carbon × 2167.37%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 184.85%1.008 × 18 = 18.144 g/mol
- N Nitrogen × 414.96%14.007 × 4 = 56.028 g/mol
- O Oxygen × 312.82%15.999 × 3 = 47.997 g/mol
Look up another formula
Compounds with the formula C21H18N4O3
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 101 to 171 of 171 compounds
![5-Methyl-2,4-dioxo-3-phenyl-N-(o-tolyl)-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidine-7-carboxamide chemical structure, C21H18N4O3, CAS 921572-84-1](/s/KNMNMKZAYMKQAB-UHFFFAOYSA-N.svg)
5-Methyl-2,4-dioxo-3-phenyl-N-(o-tolyl)-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidine-7-carboxamide
CAS 921572-84-1C21H18N4O3
![N-(4-Acetylphenyl)-2-[2-(5-methyl-1,3,4-oxadiazol-2-yl)-1H-indol-1-yl]acetamide chemical structure, C21H18N4O3, CAS 923216-92-6](/s/VWVQVLUIKXJWEJ-UHFFFAOYSA-N.svg)
N-(4-Acetylphenyl)-2-[2-(5-methyl-1,3,4-oxadiazol-2-yl)-1H-indol-1-yl]acetamide
CAS 923216-92-6C21H18N4O3
![N-(4-(Imidazo[1,2-a]pyrimidin-2-yl)phenyl)-3,5-dimethoxybenzamide chemical structure, C21H18N4O3, CAS 862811-22-1](/s/HIQZGAMGEUXCFG-UHFFFAOYSA-N.svg)
N-(4-(Imidazo[1,2-a]pyrimidin-2-yl)phenyl)-3,5-dimethoxybenzamide
CAS 862811-22-1C21H18N4O3
2-((3-(4-Ethoxyphenyl)-1,2,4-oxadiazol-5-yl)methyl)-6-phenylpyridazin-3(2H)-one
CAS 1040672-18-1C21H18N4O3
![5-Methyl-3-(4-methylphenyl)-2,4-dioxo-N-phenyl-1H,2H,3H,4H,5H-pyrrolo[3,2-d]pyrimidine-7-carboxamide chemical structure, C21H18N4O3, CAS 921534-99-8](/s/QTOLYAPLRBDQOO-UHFFFAOYSA-N.svg)
5-Methyl-3-(4-methylphenyl)-2,4-dioxo-N-phenyl-1H,2H,3H,4H,5H-pyrrolo[3,2-d]pyrimidine-7-carboxamide
CAS 921534-99-8C21H18N4O3
![1,3-Dimethyl-5-((4-phenoxyphenyl)amino)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione chemical structure, C21H18N4O3, CAS 946378-79-6](/s/MSMKFYFVXWXXAW-UHFFFAOYSA-N.svg)
1,3-Dimethyl-5-((4-phenoxyphenyl)amino)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione
CAS 946378-79-6C21H18N4O3
![N-[1-(4-Methoxybenzyl)-1H-pyrazol-5-yl]-5-phenyl-1,2-oxazole-3-carboxamide chemical structure, C21H18N4O3, CAS 1171369-97-3](/s/ZQEBQCCXPNSMFN-UHFFFAOYSA-N.svg)
N-[1-(4-Methoxybenzyl)-1H-pyrazol-5-yl]-5-phenyl-1,2-oxazole-3-carboxamide
CAS 1171369-97-3C21H18N4O3
3-Allyl-1-((3-(m-tolyl)-1,2,4-oxadiazol-5-yl)methyl)quinazoline-2,4(1H,3H)-dione
CAS 1207024-06-3C21H18N4O3
![Ethyl 3-{[2-(2-hydroxyphenyl)imidazo[1,2-a]pyrimidin-3-yl]amino}benzoate chemical structure, C21H18N4O3, CAS 1160272-82-1](/s/OCWZGUNMJPBJSL-UHFFFAOYSA-N.svg)
Ethyl 3-{[2-(2-hydroxyphenyl)imidazo[1,2-a]pyrimidin-3-yl]amino}benzoate
CAS 1160272-82-1C21H18N4O3
1-(4-Ethylphenyl)-3-(3-(2-methoxyphenyl)-1,2,4-oxadiazol-5-yl)pyridazin-4(1H)-one
CAS 1251568-99-6C21H18N4O3
1-(4-Ethylphenyl)-3-(3-(4-methoxyphenyl)-1,2,4-oxadiazol-5-yl)pyridazin-4(1H)-one
CAS 1251690-62-6C21H18N4O3
1-(o-Tolyl)-4-((3-(o-tolyl)-1,2,4-oxadiazol-5-yl)methyl)pyrazine-2,3(1H,4H)-dione
CAS 1251607-31-4C21H18N4O3
6-(3-Methoxyphenyl)-2-((3-(o-tolyl)-1,2,4-oxadiazol-5-yl)methyl)pyridazin-3(2H)-one
CAS 1251621-23-4C21H18N4O3
![3-{[2-(3-Pyridin-2-yl-1,2,4-oxadiazol-5-yl)pyrrolidin-1-yl]methyl}-4H-chromen-4-one chemical structure, C21H18N4O3, CAS 1268982-32-6](/s/APYLRWQTBUZSLT-UHFFFAOYSA-N.svg)
3-{[2-(3-Pyridin-2-yl-1,2,4-oxadiazol-5-yl)pyrrolidin-1-yl]methyl}-4H-chromen-4-one
CAS 1268982-32-6C21H18N4O3
N-(1H-Indol-6-yl)-2-(3-(3-methoxyphenyl)-6-oxopyridazin-1(6H)-yl)acetamide
CAS 1224169-38-3C21H18N4O3
N-(1H-Indol-5-yl)-2-(3-(3-methoxyphenyl)-6-oxopyridazin-1(6H)-yl)acetamide
CAS 1232791-11-5C21H18N4O3
![N-(1H-Indol-5-yl)-2-[3-(4-methoxyphenyl)-6-oxopyridazin-1(6H)-yl]acetamide chemical structure, C21H18N4O3, CAS 1246052-40-3](/s/BAIWBEWOLDRTKX-UHFFFAOYSA-N.svg)
N-(1H-Indol-5-yl)-2-[3-(4-methoxyphenyl)-6-oxopyridazin-1(6H)-yl]acetamide
CAS 1246052-40-3C21H18N4O3
![4-[5-(6-Amino-pyridin-3-ylethynyl)-6-ethyl-pyrimidin-4-yl]-2-methoxy-benzoic acid chemical structure, C21H18N4O3, CAS 1321613-23-3](/s/IKKCYEMLZCORBL-UHFFFAOYSA-N.svg)
4-[5-(6-Amino-pyridin-3-ylethynyl)-6-ethyl-pyrimidin-4-yl]-2-methoxy-benzoic acid
CAS 1321613-23-3C21H18N4O3
2-(4-Methoxyphenyl)-N-(1-methyl-1H-pyrazol-4-yl)-1-oxo-1,2-dihydroisoquinoline-4-carboxamide
CAS 1351701-84-2C21H18N4O3
![[6-(2-Amino-1,3-benzoxazol-5-yl)quinolin-3-yl]-morpholin-4-ylmethanone chemical structure, C21H18N4O3, CAS 1268454-79-0](/s/YUKFXABJHAIXLJ-UHFFFAOYSA-N.svg)
[6-(2-Amino-1,3-benzoxazol-5-yl)quinolin-3-yl]-morpholin-4-ylmethanone
CAS 1268454-79-0C21H18N4O3
3-(3-(3-(2-Methoxybenzyl)-1,2,4-oxadiazol-5-yl)azetidine-1-carbonyl)benzonitrile
CAS 1396767-71-7C21H18N4O3
![N-(1-((2,3-Dihydrobenzo[b][1,4]dioxin-2-yl)methyl)-1H-pyrazol-4-yl)-1H-indole-3-carboxamide chemical structure, C21H18N4O3, CAS 1798625-38-3](/s/BVKYHNYGSIUDSI-UHFFFAOYSA-N.svg)
N-(1-((2,3-Dihydrobenzo[b][1,4]dioxin-2-yl)methyl)-1H-pyrazol-4-yl)-1H-indole-3-carboxamide
CAS 1798625-38-3C21H18N4O3
![(E)-3-(Benzo[d][1,3]dioxol-5-yl)-1-(3-(4-phenyl-1H-1,2,3-triazol-1-yl)azetidin-1-yl)prop-2-en-1-one chemical structure, C21H18N4O3, CAS 2034997-66-3](/s/LXSTZVKOYIYZDJ-VQHVLOKHSA-N.svg)
(E)-3-(Benzo[d][1,3]dioxol-5-yl)-1-(3-(4-phenyl-1H-1,2,3-triazol-1-yl)azetidin-1-yl)prop-2-en-1-one
CAS 2034997-66-3C21H18N4O3
N-((2-(Furan-2-yl)pyridin-4-yl)methyl)-3-(4-oxoquinazolin-3(4H)-yl)propanamide
CAS 2034593-65-0C21H18N4O3
- 2-(2-Oxobenzo[d]oxazol-3(2H)-yl)-N-(2-(2-phenylpyrimidin-5-yl)ethyl)acetamide2034597-41-4C21H18N4O3
- N-(Cyanomethyl)-2-[4-methyl-4-(naphthalen-2-yl)-2,5-dioxoimidazolidin-1-yl]-N-(prop-2-yn-1-yl)acetamide1808402-19-8C21H18N4O3
- N-{2-[5-Methyl-3-(pyridin-3-yl)-1H-pyrazol-1-yl]ethyl}-4-oxo-4H-chromene-2-carboxamide2034604-00-5C21H18N4O3
- N-(2-(5-Methyl-3-(pyridin-3-yl)-1H-pyrazol-1-yl)ethyl)-2-oxo-2H-chromene-3-carboxamide2034510-31-9C21H18N4O3
- N-((5-(Furan-2-yl)pyridin-3-yl)methyl)-3-(4-oxoquinazolin-3(4H)-yl)propanamide2034537-46-5C21H18N4O3
- N-((5-(Furan-3-yl)pyridin-3-yl)methyl)-3-(4-oxoquinazolin-3(4H)-yl)propanamide2034243-47-3C21H18N4O3
- 3-Cyclopropyl-1-((3-(m-tolyl)-1,2,4-oxadiazol-5-yl)methyl)quinazoline-2,4(1H,3H)-dione2194905-30-9C21H18N4O3
- 5-(Fmoc-amino)pyridine-2-carboxamidoxime1824823-71-3C21H18N4O3
- (Z)-2-Cyano-3-[3-(3,4-dimethoxyphenyl)-1-phenylpyrazol-4-yl]prop-2-enamide379218-70-9C21H18N4O3
- N-(1-Benzyl-1H-pyrazol-5-yl)-5-(4-methoxyphenyl)-1,2-oxazole-3-carboxamide1010864-20-6C21H18N4O3
- N-(1H-Benzo[d]imidazol-2-yl)-2-(5-(2-methyl-2,3-dihydrobenzofuran-5-yl)isoxazol-3-yl)acetamide1173057-23-2C21H18N4O3
- 2-Cyano-N-(4-methoxyphenyl)-3-[3-(3-methoxyphenyl)-1H-pyrazol-4-yl]prop-2-enamide1181466-03-4C21H18N4O3
- (Z)-2-Cyano-N-(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)-3-(3-hydroxyphenyl)prop-2-enamide561291-62-1C21H18N4O3
- N-{2-Methyl-6H,7H,8H,9H-pyrazolo[1,5-a]quinazolin-7-yl}-2-oxo-2H-chromene-3-carboxamide2097924-33-7C21H18N4O3
- 3-Cyclopropyl-1-((3-(p-tolyl)-1,2,4-oxadiazol-5-yl)methyl)quinazoline-2,4(1H,3H)-dione2191266-88-1C21H18N4O3
- 3-Cyclopropyl-1-((3-(o-tolyl)-1,2,4-oxadiazol-5-yl)methyl)quinazoline-2,4(1H,3H)-dione2320722-56-1C21H18N4O3
- 1-(2,3-Dimethylphenyl)-4-({4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl}methyl)-1,2,3,4-tetrahydropyrazine-2,3-dione2548986-09-8C21H18N4O3
- Ethyl 1-methyl-4-oxo-7-(4-phenyl-1H-1,2,3-triazol-1-yl)-1,4-dihydroquinoline-3-carboxylate2549051-44-5C21H18N4O3
- 5-[3-[(1Z)-1-Hydroxyimino-2,3-dihydroinden-4-yl]-1,2,4-oxadiazol-5-yl]-2-propan-2-yloxybenzonitrile2716088-16-1C21H18N4O3
- 5-[3-[(1E)-1-Hydroxyimino-2,3-dihydroinden-4-yl]-1,2,4-oxadiazol-5-yl]-2-propan-2-yloxybenzonitrile2788886-47-3C21H18N4O3
- Ethyl 1-(4-methylphenyl)-5-oxo-7-phenyl-1,5-dihydro[1,2,4]triazolo[4,3-a]pyrimidine-3-carboxylate444902-79-8C21H18N4O3
- Benzamide, 2-[2-oxo-2-[[4-[(1E)-2-phenyldiazenyl]phenyl]amino]ethoxy]-1002535-35-4C21H18N4O3
- [5-(2,4-Diphenyl-oxazol-5-yl)-2H-pyrazol-3-ylmethyl]-carbamic acid methyl ester351428-43-8C21H18N4O3
- Benzamide, N-[3-methyl-4-[2-(2-methylphenyl)diazenyl]phenyl]-4-nitro-886135-49-5C21H18N4O3
- Benzamide, N-[3-methyl-4-[2-(2-methylphenyl)diazenyl]phenyl]-3-nitro-886135-56-4C21H18N4O3
- 6,7-Dimethoxy-4-[[6-methyl-2-(2-pyrimidinyl)-3-pyridinyl]oxy]quinoline863786-63-4C21H18N4O3
- Benzamide, 2-(2-amino-2-oxoethoxy)-N-[4-(2-phenyldiazenyl)phenyl]-1008882-79-8C21H18N4O3
- N-(3,5-Dimethoxyphenyl)-4-(2-phenyl-1,3-oxazol-5-yl)pyrimidin-2-amine647030-90-8C21H18N4O3
- Urea, N-(1,3-benzodioxol-5-ylmethyl)-N'-[4-(2-phenyldiazenyl)phenyl]-1390826-16-0C21H18N4O3
- Phenyl (4-methyl-3-(5-methylisoxazol-3-yl)-1-phenyl-1H-pyrazol-5-yl)carbamate1414572-40-9C21H18N4O3
- Phenyl (3-(3,5-dimethylisoxazol-4-yl)-1-phenyl-1H-pyrazol-5-yl)carbamate1414572-39-6C21H18N4O3
- 2-{2-[3-(2-Methyl-1H-1,3-benzodiazol-1-yl)azetidin-1-yl]-2-oxoethyl}-2,3-dihydro-1H-isoindole-1,3-dione2380181-94-0C21H18N4O3
- 2-Benzyl-5-{4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl}-octahydropyrrolo[3,4-c]pyrrole-1,3-dione2415630-84-9C21H18N4O3
- N-Phenyl-N-(1-(phenylimino)ethyl)-N'-m-nitrophenylurea73840-12-7C21H18N4O3
- 3-(1-Benzofuran-2-yl)-1-(4-nitrophenyl)-5,6,7,8-tetrahydro-4H-pyrazolo[5,4-b]azepine578704-16-2C21H18N4O3
- 3-(1-Benzofuran-2-yl)-1-(2-nitrophenyl)-5,6,7,8-tetrahydro-4H-pyrazolo[5,4-b]azepine577958-60-2C21H18N4O3
- 4(3H)-Quinazolinone, 3-(4,5-dihydro-4-((4-methoxyphenyl)methylene)-2-methyl-5-oxo-1H-imidazol-1-yl)-2-methyl-114496-21-8C21H18N4O3
- 2-[5-Cyano-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidin-1-yl]-N-(4-methoxyphenyl)acetamide950262-77-8C21H18N4O3
- 2-{[3-(3-Methoxyphenyl)-1,2,4-oxadiazol-5-yl]methyl}-6-(4-methylphenyl)-2,3-dihydropyridazin-3-one1359380-52-1C21H18N4O3
- 3-{[2-(2H-1,3-Benzodioxol-5-yl)-4-oxo-4H,5H-pyrazolo[1,5-a]pyrazin-5-yl]methyl}benzonitrile1326833-05-9C21H18N4O3
- N-(2-((3,5-Dimethyl-1H-pyrazol-4-yl)methyl)-1,3-dioxoisoindolin-5-yl)benzamide50699-22-4C21H18N4O3
- 4-({2-[3-(4-Methoxyphenyl)-1,2,4-oxadiazol-5-yl]pyrrolidin-1-yl}carbonyl)benzonitrile1787855-55-3C21H18N4O3
- 5-(3-Methyl-4-oxo-3,4-dihydroquinazolin-2-yl)-2-phenyl-octahydropyrrolo[3,4-c]pyrrole-1,3-dione2415454-54-3C21H18N4O3
- (9H-Fluoren-9-yl)methyl N-(4-cyclopropyl-6-hydroxy-1,3,5-triazin-2-yl)carbamate2763912-93-0C21H18N4O3
- (9H-Fluoren-9-yl)methyl N-[4-cyano-1-(2-hydroxyethyl)-1H-pyrazol-5-yl]carbamate2764016-56-8C21H18N4O3
- (9H-Fluoren-9-yl)methyl N-[4-cyano-1-(2-hydroxyethyl)-1H-pyrazol-3-yl]carbamate2764009-65-4C21H18N4O3
- 2-(1,5-Dimethyl-3-oxo-2-phenylpyrazol-4-yl)-5-phenyl-1H-pyrimidine-4,6-dione21585-49-9C21H18N4O3
Frequently asked questions
What is the molar mass of C21H18N4O3?
The molar mass of C21H18N4O3 is 374.40 g/mol, calculated from standard atomic weights for 21 carbon atoms, 18 hydrogen atoms, 4 nitrogen atoms and 3 oxygen atoms. The monoisotopic mass is 374.1379 Da.
How many compounds have the formula C21H18N4O3?
CompoundList lists 171 compounds with the molecular formula C21H18N4O3, including 5-Methyl-2,4-dioxo-3-phenyl-N-(o-tolyl)-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidine-7-carboxamide, N-(4-Acetylphenyl)-2-[2-(5-methyl-1,3,4-oxadiazol-2-yl)-1H-indol-1-yl]acetamide, N-(4-(Imidazo[1,2-a]pyrimidin-2-yl)phenyl)-3,5-dimethoxybenzamide. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.
What is the degree of unsaturation of C21H18N4O3?
C21H18N4O3 has a degree of unsaturation of 15. That is the total number of rings and pi bonds (a double bond counts as one, a triple bond as two) in any structure with this formula.