Molecular formula
C21H16N4O
62 compounds have this formula on CompoundList.
- Molar mass
- 340.39g/mol
- Monoisotopic mass
- 340.1324Da
- Atoms
- 42
- Elements
- 4
- Rings plus double bonds
- 16
The formula C21H16N4O describes a molecule made of 21 carbon atoms, 16 hydrogen atoms, 4 nitrogen atoms and 1 oxygen atom. 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 × 2174.10%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 164.74%1.008 × 16 = 16.128 g/mol
- N Nitrogen × 416.46%14.007 × 4 = 56.028 g/mol
- O Oxygen × 14.70%15.999 × 1 = 15.999 g/mol
Look up another formula
Compounds with the formula C21H16N4O
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 62 of 62 compounds
2-(2-Quinolin-3-ylpyridin-4-yl)-1,5,6,7-tetrahydro-4H-pyrrolo(3,2-C)pyridin-4-one
CAS 724711-21-1C21H16N4O
![4-(4-Hydroxy-phenylamino)-2,3-dihydro-1H-4a,9-diaza-cyclopenta[b]fluorene-10-carbonitrile chemical structure, C21H16N4O, CAS 305333-85-1](/s/HLBVUEBBNPWRIH-UHFFFAOYSA-N.svg)
4-(4-Hydroxy-phenylamino)-2,3-dihydro-1H-4a,9-diaza-cyclopenta[b]fluorene-10-carbonitrile
CAS 305333-85-1C21H16N4O
![3-(Furan-2-ylmethyl)-2-(4-methylphenyl)imidazo[4,5-b]quinoxaline chemical structure, C21H16N4O, CAS 4860-47-3](/s/MDFGBLBCMOXAMG-UHFFFAOYSA-N.svg)
3-(Furan-2-ylmethyl)-2-(4-methylphenyl)imidazo[4,5-b]quinoxaline
CAS 4860-47-3C21H16N4O
2-Pyridin-4-yl-N-(pyridin-2-ylmethyl)quinoline-4-carboxamide
CAS 724748-97-4C21H16N4O
![2-[(4,5-Diphenyl-1H-imidazol-2-yl)diazenyl]phenol chemical structure, C21H16N4O, CAS 60037-63-0](/s/ATEQMZYYZRYXHI-UHFFFAOYSA-N.svg)
2-[(4,5-Diphenyl-1H-imidazol-2-yl)diazenyl]phenol
CAS 60037-63-0C21H16N4O
2-Pyridin-3-yl-N-(pyridin-2-ylmethyl)quinoline-4-carboxamide
CAS 689269-44-1C21H16N4O
2-Pyridin-2-yl-N-(pyridin-3-ylmethyl)quinoline-4-carboxamide
CAS 438028-66-1C21H16N4O
Benzamide, N-(2,5-diphenyl-2H-1,2,3-triazol-4-yl)-
CAS 61308-15-4C21H16N4O
N-(6-Methylpyridin-2-yl)-2-(pyridin-2-yl)quinoline-4-carboxamide
CAS 879919-66-1C21H16N4O
![10-(4-Isopropylphenyl)-9H-indeno[1,2-d][1,2,4]triazolo[1,5-a]pyrimidin-9-one chemical structure, C21H16N4O, CAS 497943-64-3](/s/PDZLSGLMGQSDCJ-UHFFFAOYSA-N.svg)
10-(4-Isopropylphenyl)-9H-indeno[1,2-d][1,2,4]triazolo[1,5-a]pyrimidin-9-one
CAS 497943-64-3C21H16N4O
![2-(Furan-2-yl)-1-phenethyl-1H-imidazo[4,5-b]quinoxaline chemical structure, C21H16N4O, CAS 840459-01-0](/s/WYZLSLCKBOQBDW-UHFFFAOYSA-N.svg)
2-(Furan-2-yl)-1-phenethyl-1H-imidazo[4,5-b]quinoxaline
CAS 840459-01-0C21H16N4O
![1-(3-{[2-(Pyridin-3-yl)quinazolin-4-yl]amino}phenyl)ethan-1-one chemical structure, C21H16N4O, CAS 1118807-60-5](/s/OKRMIOKQUOUFAU-UHFFFAOYSA-N.svg)
1-(3-{[2-(Pyridin-3-yl)quinazolin-4-yl]amino}phenyl)ethan-1-one
CAS 1118807-60-5C21H16N4O
2-Pyridin-4-yl-N-(pyridin-3-ylmethyl)quinoline-4-carboxamide
CAS 669731-32-2C21H16N4O
N-Phenyl-4-(5-phenyl-1H-1,2,3-triazol-1-yl)benzamide
CAS 915933-07-2C21H16N4O
![2-Anilino-3-(phenyliminomethyl)pyrido[1,2-a]pyrimidin-4-one chemical structure, C21H16N4O, CAS 324769-95-1](/s/KJIFTZNIUVMAEV-UHFFFAOYSA-N.svg)
2-Anilino-3-(phenyliminomethyl)pyrido[1,2-a]pyrimidin-4-one
CAS 324769-95-1C21H16N4O
![N-[4-(5-Phenyl-1H-1,2,3-triazol-1-yl)phenyl]benzamide chemical structure, C21H16N4O, CAS 89779-04-4](/s/KDZJYRWSHUHJAB-UHFFFAOYSA-N.svg)
N-[4-(5-Phenyl-1H-1,2,3-triazol-1-yl)phenyl]benzamide
CAS 89779-04-4C21H16N4O
N-(6-Methylpyridin-2-yl)-2-(pyridin-4-yl)quinoline-4-carboxamide
CAS 879920-38-4C21H16N4O
4H-Imidazol-4-one, 1,5-dihydro-1-phenyl-2-(phenylamino)-5-(phenylimino)-
CAS 68822-96-8C21H16N4O
![N-(9-Cyano-1-methyl-1H-benzo[f]indol-4-yl)-N'-phenylurea chemical structure, C21H16N4O, CAS 439095-03-1](/s/GCYJWXWZUTVYPZ-UHFFFAOYSA-N.svg)
N-(9-Cyano-1-methyl-1H-benzo[f]indol-4-yl)-N'-phenylurea
CAS 439095-03-1C21H16N4O
(E)-N'-Benzylidene-3-(naphthalen-1-yl)-1H-pyrazole-5-carbohydrazide
CAS 634888-06-5C21H16N4O
N,1,5-triphenyl-1H-1,2,3-triazole-4-carboxamide
CAS 688317-87-5C21H16N4O
![1-(4-Acetylanilino)-3-methylpyrido[1,2-a]benzimidazole-4-carbonitrile chemical structure, C21H16N4O, CAS 305332-30-3](/s/KIQRQMAMHARPSV-UHFFFAOYSA-N.svg)
1-(4-Acetylanilino)-3-methylpyrido[1,2-a]benzimidazole-4-carbonitrile
CAS 305332-30-3C21H16N4O
AK-830/13217126
CAS 61588-68-9C21H16N4O
![(2E)-3-Methyl-2-[(3-methylanilino)methylidene]-1-oxopyrido[1,2-a]benzimidazole-4-carbonitrile chemical structure, C21H16N4O, CAS 881565-75-9](/s/IFQPXHCNAAIKPM-SFQUDFHCSA-N.svg)
(2E)-3-Methyl-2-[(3-methylanilino)methylidene]-1-oxopyrido[1,2-a]benzimidazole-4-carbonitrile
CAS 881565-75-9C21H16N4O
- N-(3-Methylpyridin-2-yl)-2-(pyridin-3-yl)quinoline-4-carboxamide1031573-29-1C21H16N4O
- N-(5-Methylpyridin-2-yl)-2-(pyridin-2-yl)quinoline-4-carboxamide438028-05-8C21H16N4O
- 2,6-Diphenyl-6,7-dihydro[1,2,4]triazolo[5,1-b]quinazolin-8(5H)-one932209-48-8C21H16N4O
- 2-(Pyridin-2-yl)-N-(pyridin-2-ylmethyl)quinoline-4-carboxamide1031678-97-3C21H16N4O
- 2-(Pyridin-2-yl)-N-(pyridin-4-ylmethyl)quinoline-4-carboxamide1144484-60-5C21H16N4O
- 2-(Pyridin-4-yl)-N-(pyridin-4-ylmethyl)quinoline-4-carboxamide1144442-32-9C21H16N4O
- N-[4-[(3-Phenyl-2-pyrazinyl)oxy]phenyl]-2-pyridinamine1231923-02-6C21H16N4O
- N-[3-(5-Phenyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)phenyl]prop-2-enamide1443237-11-3C21H16N4O
- 2-Phenyl-4-isonicotinyl-hydrazino-quinoline159586-78-4C21H16N4O
- 2-(Furan-2-yl)-1-(4-methylbenzyl)-1H-imidazo[4,5-b]quinoxaline836631-74-4C21H16N4O
- N-(5-Methylpyridin-2-yl)-2-(pyridin-3-yl)quinoline-4-carboxamide1031648-90-4C21H16N4O
- 3-(2,4-Dimethylphenyl)benzo[4,5]imidazo[1,2-a]pyrido[3,4-e]pyrimidin-4(3H)-one1087637-70-4C21H16N4O
- N-(4-(3-(Pyridin-4-yl)pyridin-2-yloxy)phenyl)pyridin-2-amine1231920-02-7C21H16N4O
- (E)-N-(2-(Imidazo[1,2-a]pyridin-2-yl)phenyl)-3-(pyridin-3-yl)acrylamide1799264-90-6C21H16N4O
- N-(4-(Imidazo[1,2-A]pyridin-5-yl)-3-methylphenyl)furo[3,2-C]pyridin-4-amine1609577-35-6C21H16N4O
- N-([2,4'-Bipyridin]-3-ylmethyl)quinoline-2-carboxamide2034432-78-3C21H16N4O
- N-((3-(Pyridin-3-yl)pyrazin-2-yl)methyl)-1-naphthamide2034466-56-1C21H16N4O
- 6,7-Dihydro-6-phenylquinazolino[3,2-d][1,3,4]benzotriazepin-9(5H)-one116274-75-0C21H16N4O
- 5-(3-((1H-Imidazol-1-yl)methyl)-1H-indol-1-yl)-3-phenylisoxazole137187-90-7C21H16N4O
- N'-(4-Oxo-2-phenylquinazolin-3(4H)-yl)benzenecarboximidamide61330-42-5C21H16N4O
- 5-Phenyl-4-(pyridin-2-ylmethylamino)quinazoline-2-carbaldehyde1272357-03-5C21H16N4O
- N-(3-{3-Phenylpyrazolo[1,5-a]pyrimidin-7-yl}phenyl)prop-2-enamide2305341-26-6C21H16N4O
- 1,2,3-Benzotriazin-4(3H)-one, 3-[[(4-methylphenyl)imino]phenylmethyl]-58217-21-3C21H16N4O
- 1-[4-[6-(5-Isoquinolinylamino)-4-pyrimidinyl]phenyl]ethanone697740-36-6C21H16N4O
- 2-(3-((1-Methyl-4-(pyridin-4-yl)-1H-pyrazol-3-yl)oxy)prop-1-yn-1-yl)quinoline1401808-01-2C21H16N4O
- N-[4-(1-Phenyl-1H-pyrazol-5-yl)phenyl]pyridine-4-carboxamide62089-22-9C21H16N4O
- N-[4-(1-Phenyl-1H-pyrazol-5-yl)phenyl]pyridine-3-carboxamide62089-21-8C21H16N4O
- 3-[(4-Cyanophenyl)azo]-9H-carbazole-9-ethanol918328-55-9C21H16N4O
- (6-([2,2'-Bipyridin]-6-yl)-2-phenylpyrimidin-4-yl)methanol922726-30-5C21H16N4O
- 2-(1H-Benzimidazol-2-yl)-6-(1,3-dihydro-2H-benzimidazol-2-ylidene)-4-methylcyclohexa-2,4-dien-1-one769171-68-8C21H16N4O
- N'-[(3-Phenyl-1H-pyrazol-4-yl)methylidene]naphthalene-2-carbohydrazide895966-64-0C21H16N4O
- 2-Trityl-2H-tetrazole-5-carbaldehyde2469042-65-5C21H16N4O
- 1-[(4-Methyl-6-phenylpyridazin-3-yl)diazenyl]naphthalen-2-ol81819-92-3C21H16N4O
- 2-Amino-5-(1H-imidazol-1-yl)-4,6-diphenyl-4H-pyran-3-carbonitrile184706-39-6C21H16N4O
- N-[4-(1-Phenyl-1H-pyrazol-5-yl)phenyl]pyridine-2-carboxamide62089-23-0C21H16N4O
- 3-(6-(Benzyloxy)-1H-indol-2-yl)-1H-pyrazolo[4,3-b]pyridine1294514-52-5C21H16N4O
- Benzamide, 3-(cyanomethyl)-N-[4-(2-phenyldiazenyl)phenyl]-1648530-06-6C21H16N4O
- 5-Methyl-6-methylidene-3-oxo-2-[(phenanthridin-6-yl)methyl]-1,2,3,6-tetrahydropyridazine-4-carbonitrile2411279-25-7C21H16N4O
Frequently asked questions
What is the molar mass of C21H16N4O?
The molar mass of C21H16N4O is 340.39 g/mol, calculated from standard atomic weights for 21 carbon atoms, 16 hydrogen atoms, 4 nitrogen atoms and 1 oxygen atom. The monoisotopic mass is 340.1324 Da.
How many compounds have the formula C21H16N4O?
CompoundList lists 62 compounds with the molecular formula C21H16N4O, including 2-(2-Quinolin-3-ylpyridin-4-yl)-1,5,6,7-tetrahydro-4H-pyrrolo(3,2-C)pyridin-4-one, 4-(4-Hydroxy-phenylamino)-2,3-dihydro-1H-4a,9-diaza-cyclopenta[b]fluorene-10-carbonitrile, 3-(Furan-2-ylmethyl)-2-(4-methylphenyl)imidazo[4,5-b]quinoxaline. 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 C21H16N4O?
C21H16N4O has a degree of unsaturation of 16. 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.