Molecular formula
C21H18N4O2
201 compounds have this formula on CompoundList.
- Molar mass
- 358.40g/mol
- Monoisotopic mass
- 358.1430Da
- Atoms
- 45
- Elements
- 4
- Rings plus double bonds
- 15
The formula C21H18N4O2 describes a molecule made of 21 carbon atoms, 18 hydrogen atoms, 4 nitrogen atoms and 2 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 × 2170.38%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 185.06%1.008 × 18 = 18.144 g/mol
- N Nitrogen × 415.63%14.007 × 4 = 56.028 g/mol
- O Oxygen × 28.93%15.999 × 2 = 31.998 g/mol
Look up another formula
Compounds with the formula C21H18N4O2
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 101 to 200 of 201 compounds
![1-(3-Methylbenzyl)-3-(pyridin-4-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione chemical structure, C21H18N4O2, CAS 941953-77-1](/s/ISCMBFYEFPMGFZ-UHFFFAOYSA-N.svg)
1-(3-Methylbenzyl)-3-(pyridin-4-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione
CAS 941953-77-1C21H18N4O2
![1-(4-Methylbenzyl)-3-(pyridin-4-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione chemical structure, C21H18N4O2, CAS 941902-72-3](/s/LMGAABGHNPSQPM-UHFFFAOYSA-N.svg)
1-(4-Methylbenzyl)-3-(pyridin-4-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione
CAS 941902-72-3C21H18N4O2
![N-(5-(6-Methoxyimidazo[1,2-b]pyridazin-2-yl)-2-methylphenyl)benzamide chemical structure, C21H18N4O2, CAS 946268-00-4](/s/DIJXHUFFTGXTQM-UHFFFAOYSA-N.svg)
N-(5-(6-Methoxyimidazo[1,2-b]pyridazin-2-yl)-2-methylphenyl)benzamide
CAS 946268-00-4C21H18N4O2
![5-Ethyl-3-oxo-N,2-diphenyl-3,5-dihydro-2H-pyrazolo[4,3-c]pyridine-7-carboxamide chemical structure, C21H18N4O2, CAS 923121-55-5](/s/DNMMAADORDUULB-UHFFFAOYSA-N.svg)
5-Ethyl-3-oxo-N,2-diphenyl-3,5-dihydro-2H-pyrazolo[4,3-c]pyridine-7-carboxamide
CAS 923121-55-5C21H18N4O2
![2-{[3-(2,5-Dimethylphenyl)-6-oxopyridazin-1(6H)-yl]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one chemical structure, C21H18N4O2, CAS 891396-93-3](/s/IWKIXBUYFRQZEQ-UHFFFAOYSA-N.svg)
2-{[3-(2,5-Dimethylphenyl)-6-oxopyridazin-1(6H)-yl]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
CAS 891396-93-3C21H18N4O2
![5-Methyl-N-(3-methylphenyl)-3-oxo-2-phenyl-3,5-dihydro-2H-pyrazolo[4,3-c]pyridine-7-carboxamide chemical structure, C21H18N4O2, CAS 923121-70-4](/s/UGBVEYCZAJOKIK-UHFFFAOYSA-N.svg)
5-Methyl-N-(3-methylphenyl)-3-oxo-2-phenyl-3,5-dihydro-2H-pyrazolo[4,3-c]pyridine-7-carboxamide
CAS 923121-70-4C21H18N4O2
1-(Indolin-1-yl)-2-(3-(5-methyl-1,3,4-oxadiazol-2-yl)-1H-indol-1-yl)ethanone
CAS 1021106-21-7C21H18N4O2
![N-(3-Cyanophenyl)-2-(10-oxo-3,4-dihydrobenzo[b][1,6]naphthyridin-2(1H,5H,10H)-yl)acetamide chemical structure, C21H18N4O2, CAS 1251613-00-9](/s/RCIFRTLVXLJZQZ-UHFFFAOYSA-N.svg)
N-(3-Cyanophenyl)-2-(10-oxo-3,4-dihydrobenzo[b][1,6]naphthyridin-2(1H,5H,10H)-yl)acetamide
CAS 1251613-00-9C21H18N4O2
1-(3,4-Dimethylphenyl)-3-(3-(o-tolyl)-1,2,4-oxadiazol-5-yl)pyridazin-4(1H)-one
CAS 1112339-15-7C21H18N4O2
![2-{2-[3-(4-Methylphenyl)-1,2,4-oxadiazol-5-yl]-1H-pyrrol-1-yl}-N-phenylacetamide chemical structure, C21H18N4O2, CAS 1260924-98-8](/s/IEGZNJHBOZKJRD-UHFFFAOYSA-N.svg)
2-{2-[3-(4-Methylphenyl)-1,2,4-oxadiazol-5-yl]-1H-pyrrol-1-yl}-N-phenylacetamide
CAS 1260924-98-8C21H18N4O2
![2-Cyano-3-(4-cyanophenyl)-N-[4-(morpholin-4-yl)phenyl]prop-2-enamide chemical structure, C21H18N4O2, CAS 849625-04-3](/s/YZAIVXWETISIQI-AQTBWJFISA-N.svg)
2-Cyano-3-(4-cyanophenyl)-N-[4-(morpholin-4-yl)phenyl]prop-2-enamide
CAS 849625-04-3C21H18N4O2
![(3-(1H-Pyrrol-1-yl)-2-(o-tolyl)pyrrolo[3,4-c]pyrazol-5(2H,4H,6H)-yl)(furan-2-yl)methanone chemical structure, C21H18N4O2, CAS 1251574-27-2](/s/UOLVVSYRILPVFG-UHFFFAOYSA-N.svg)
(3-(1H-Pyrrol-1-yl)-2-(o-tolyl)pyrrolo[3,4-c]pyrazol-5(2H,4H,6H)-yl)(furan-2-yl)methanone
CAS 1251574-27-2C21H18N4O2
![(2,5-Dihydro-1H-pyrrol-1-yl)[2-[4-(2-pyridinylamino)phenoxy]-3-pyridinyl]methanone chemical structure, C21H18N4O2, CAS 1231924-81-4](/s/RSVXVQYOXHXHSY-UHFFFAOYSA-N.svg)
(2,5-Dihydro-1H-pyrrol-1-yl)[2-[4-(2-pyridinylamino)phenoxy]-3-pyridinyl]methanone
CAS 1231924-81-4C21H18N4O2
(3-(3-Benzyl-1,2,4-oxadiazol-5-yl)azetidin-1-yl)(1H-indol-5-yl)methanone
CAS 1396870-49-7C21H18N4O2
![12-[3-(Pyridin-2-yloxy)benzoyl]-4,6,12-triazatricyclo[7.2.1.0^{2,7}]dodeca-2(7),3,5-triene chemical structure, C21H18N4O2, CAS 1903108-96-2](/s/JNARJYKLHRLGIG-UHFFFAOYSA-N.svg)
12-[3-(Pyridin-2-yloxy)benzoyl]-4,6,12-triazatricyclo[7.2.1.0^{2,7}]dodeca-2(7),3,5-triene
CAS 1903108-96-2C21H18N4O2
(3-(Pyrazin-2-ylamino)azetidin-1-yl)(9H-xanthen-9-yl)methanone
CAS 2319839-56-8C21H18N4O2
5-Benzyl-6-methyl-2-(5-oxo-3-phenyl-2,5-dihydro-1H-pyrazol-1-yl)-4(3H)-pyrimidinone
CAS 866019-73-0C21H18N4O2
2-(4-Benzyl-3-methyl-5-oxo-2,5-dihydro-1H-pyrazol-1-yl)-6-phenyl-4(3H)-pyrimidinone
CAS 866137-81-7C21H18N4O2
![3-(Benzimidazol-1-yl)-N-[(E)-(2-hydroxynaphthalen-1-yl)methylideneamino]propanamide chemical structure, C21H18N4O2, CAS 1449030-72-1](/s/SQPJQVNNXUXWLU-QRVIBDJDSA-N.svg)
3-(Benzimidazol-1-yl)-N-[(E)-(2-hydroxynaphthalen-1-yl)methylideneamino]propanamide
CAS 1449030-72-1C21H18N4O2
![(E)-N-[2-(4-Ethylphenyl)benzotriazol-5-yl]-3-(furan-2-yl)prop-2-enamide chemical structure, C21H18N4O2, CAS 371206-85-8](/s/QAFCDOFMRLBJCF-ZRDIBKRKSA-N.svg)
(E)-N-[2-(4-Ethylphenyl)benzotriazol-5-yl]-3-(furan-2-yl)prop-2-enamide
CAS 371206-85-8C21H18N4O2
![N-[1-[(4-Methylphenyl)methyl]pyrazol-4-yl]-5-phenyl-1,2-oxazole-3-carboxamide chemical structure, C21H18N4O2, CAS 1005663-43-3](/s/ZFQNKCMTCIXBLI-UHFFFAOYSA-N.svg)
N-[1-[(4-Methylphenyl)methyl]pyrazol-4-yl]-5-phenyl-1,2-oxazole-3-carboxamide
CAS 1005663-43-3C21H18N4O2
![N-[1-[(3-Methylphenyl)methyl]pyrazol-4-yl]-5-phenyl-1,2-oxazole-3-carboxamide chemical structure, C21H18N4O2, CAS 1005616-13-6](/s/HGRMZPGBCXCHPQ-UHFFFAOYSA-N.svg)
N-[1-[(3-Methylphenyl)methyl]pyrazol-4-yl]-5-phenyl-1,2-oxazole-3-carboxamide
CAS 1005616-13-6C21H18N4O2
![2-Ethoxy-N-(3-imidazo[1,2-a]pyrimidin-2-ylphenyl)benzamide chemical structure, C21H18N4O2, CAS 863020-11-5](/s/ITBRHZNXLKKTCO-UHFFFAOYSA-N.svg)
2-Ethoxy-N-(3-imidazo[1,2-a]pyrimidin-2-ylphenyl)benzamide
CAS 863020-11-5C21H18N4O2
![4-Ethoxy-N-(3-imidazo[1,2-a]pyrimidin-2-ylphenyl)benzamide chemical structure, C21H18N4O2, CAS 863020-12-6](/s/AMEHQLWCLKSAGR-UHFFFAOYSA-N.svg)
4-Ethoxy-N-(3-imidazo[1,2-a]pyrimidin-2-ylphenyl)benzamide
CAS 863020-12-6C21H18N4O2
- N-(5-(Imidazo[1,2-a]pyrimidin-2-yl)-2-methoxyphenyl)-4-methylbenzamide847388-01-6C21H18N4O2
- 1-(2,3-Dimethylphenyl)-5-phenacylpyrazolo[3,4-d]pyrimidin-4-one894995-46-1C21H18N4O2
- 1-(2,4-Dimethylphenyl)-5-phenacylpyrazolo[3,4-d]pyrimidin-4-one895003-79-9C21H18N4O2
- 4-Phenoxy-N-[2-([1,2,4]triazolo[4,3-a]pyridin-3-yl)ethyl]benzamide883471-90-7C21H18N4O2
- 1-(3-Methoxyphenyl)-5-methyl-N-(naphthalen-1-yl)-1H-1,2,3-triazole-4-carboxamide924837-75-2C21H18N4O2
- 1-(2-Methylbenzyl)-3-(pyridin-2-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione941989-49-7C21H18N4O2
- 2-(4-Oxo-2-phenylpyrazolo[1,5-a]pyrazin-5(4H)-yl)-N-(m-tolyl)acetamide941962-93-2C21H18N4O2
- 5-(4-Methylphenyl)-N-[3-(1H-pyrazol-1-ylmethyl)phenyl]-1,2-oxazole-3-carboxamide1005661-01-7C21H18N4O2
- 5-Methyl-N-(2-methylphenyl)-3-oxo-2-phenyl-2H,3H,5H-pyrazolo[4,3-c]pyridine-7-carboxamide923173-83-5C21H18N4O2
- Morpholin-4-yl[7-(naphthalen-2-yl)pyrazolo[1,5-a]pyrimidin-2-yl]methanone932241-50-4C21H18N4O2
- 6-(4-Methylphenyl)-2-{[3-(4-methylphenyl)-1,2,4-oxadiazol-5-yl]methyl}-2,3-dihydropyridazin-3-one1040657-91-7C21H18N4O2
- N-Benzyl-5-methyl-3-oxo-2-phenyl-3,5-dihydro-2H-pyrazolo[4,3-c]pyridine-7-carboxamide923121-08-8C21H18N4O2
- 2-((3-(3,4-Dimethylphenyl)-1,2,4-oxadiazol-5-yl)methyl)-6-phenylpyridazin-3(2H)-one1207035-35-5C21H18N4O2
- 4-({3-Methyl-4-[(6-methylpyridin-3-yl)oxy]phenyl}amino)quinazolin-6-ol848438-87-9C21H18N4O2
- 3-[2-Oxo-2-(1,3,4,9-tetrahydro-2H-beta-carbolin-2-yl)ethyl]quinazolin-4(3H)-one1574474-49-9C21H18N4O2
- 2-[4-(Acetylamino)-1H-indol-1-yl]-N-(quinolin-5-yl)acetamide1574292-27-5C21H18N4O2
- 3-[3-(3,4-Dimethylphenyl)-1,2,4-oxadiazol-5-yl]-1-(4-methylphenyl)pyridazin-4(1H)-one1986519-15-6C21H18N4O2
- N-{[2-(Furan-2-yl)pyridin-4-yl]methyl}-1-methyl-3-phenyl-1H-pyrazole-5-carboxamide2034342-14-6C21H18N4O2
- N-{[2-(Furan-2-yl)pyridin-4-yl]methyl}-5-methyl-1-phenyl-1H-pyrazole-4-carboxamide2034593-73-0C21H18N4O2
- (1H-Benzo[d]imidazol-5-yl)(3-(quinolin-8-yloxy)pyrrolidin-1-yl)methanone1903269-02-2C21H18N4O2
- (3-(1,2,4-Oxadiazol-3-yl)-4-phenylpyrrolidin-1-yl)(1H-indol-6-yl)methanone2034286-00-3C21H18N4O2
- 6-Ethoxy-N-(2-(imidazo[1,2-a]pyridin-2-yl)phenyl)nicotinamide2034616-93-6C21H18N4O2
- (3-(Pyrimidin-2-ylamino)azetidin-1-yl)(9H-xanthen-9-yl)methanone2034605-65-5C21H18N4O2
- 3-(3-(4-Oxoquinazolin-3(4H)-yl)piperidine-1-carbonyl)benzonitrile2034423-05-5C21H18N4O2
- N-((6-(Furan-3-yl)pyridin-3-yl)methyl)-5-methyl-1-phenyl-1H-pyrazole-4-carboxamide2034227-09-1C21H18N4O2
- N-((5-(Furan-2-yl)pyridin-3-yl)methyl)-5-methyl-1-phenyl-1H-pyrazole-4-carboxamide2034314-90-2C21H18N4O2
- 1-((3-(Furan-3-yl)pyrazin-2-yl)methyl)-3-(naphthalen-1-ylmethyl)urea2034238-01-0C21H18N4O2
- N-([3,3'-Bipyridin]-5-ylmethyl)-6-methoxy-1H-indole-2-carboxamide2191267-41-9C21H18N4O2
- 3-Methyl-4-oxo-1-phenyl-N-(o-tolyl)-4,7-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxamide941959-07-5C21H18N4O2
- N-Benzyl-3-methyl-4-oxo-1-phenyl-4,7-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxamide941936-27-2C21H18N4O2
- 5-Hydroxy-N-{3-methyl-4-[(6-methylpyridin-3-yl)oxy]phenyl}quinazolin-4-amine871019-20-4C21H18N4O2
- (E)-3-[2,5-Dimethyl-1-(4-methylpyridin-2-yl)pyrrol-3-yl]-2-(4-nitrophenyl)prop-2-enenitrile675857-93-9C21H18N4O2
- N-[1H-1,2,3-Benzotriazol-1-yl(4-methoxyphenyl)methyl]benzamide134004-79-8C21H18N4O2
- 2-(2-Methyl-4-(4-nitrophenylazo)phenyl)isoindoline200394-28-1C21H18N4O2
- 4(3H)-Quinazolinone, 3-(4,5-dihydro-2-methyl-5-oxo-4-(phenylmethylene)-1H-imidazol-1-yl)-2-ethyl-114496-26-3C21H18N4O2
- Benzyl [2-(4-methylphenyl)imidazo[1,2-a]pyrimidin-3-yl]carbamate865285-02-5C21H18N4O2
- Benz[cd]indol-2(1H)-one, 1-acetyl-6-[2-[4-(dimethylamino)phenyl]diazenyl]-852539-05-0C21H18N4O2
- 2-Cyclopentyl-8-(pyridin-4-yl)pyrido[4,3-b][1,6]naphthyridine-1,9(2H,8H)-dione1158777-16-2C21H18N4O2
- 2-Cyano-3-(3,5-dimethyl-1H-pyrazol-4-yl)-N-(2-phenoxyphenyl)prop-2-enamide1239970-24-1C21H18N4O2
- 3-(1-Benzyl-1H-pyrazol-4-yl)-2-cyano-N-(2-methoxyphenyl)prop-2-enamide1212780-96-5C21H18N4O2
- N-(1-Methyl-1H-indol-4-yl)-2-(6-oxo-3-phenylpyridazin-1(6H)-yl)acetamide1324085-67-7C21H18N4O2
- 1-Benzyl-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one1357192-31-4C21H18N4O2
- N-(7-Methoxyquinolin-3-yl)-2,3-dimethylquinoxaline-6-carboxamide1435976-30-9C21H18N4O2
- N-[Cyano(1-phenyl-1H-pyrazol-4-yl)methyl]-3,4-dihydro-2H-1-benzopyran-4-carboxamide1384783-51-0C21H18N4O2
- (Z)-2-Cyano-N-(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)-3-phenylprop-2-enamide1321892-92-5C21H18N4O2
- 3,5-Diamino-1-(4-phenoxyphenyl)-1H-indole-2-carboxamide1643531-18-3C21H18N4O2
- 2-{[1-(Indolizine-2-carbonyl)pyrrolidin-3-yl]oxy}quinoxaline2097933-28-1C21H18N4O2
- N-[1-(9H-Xanthene-9-carbonyl)azetidin-3-yl]pyridazin-3-amine2097866-86-7C21H18N4O2
- 2-Methyl-1-oxo-3-phenyl-N-(pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinoline-4-carboxamide2548983-79-3C21H18N4O2
- Phenol, 2-(5-((4-methoxyphenyl)amino)-4-phenyl-4H-1,2,4-triazol-3-yl)-82619-92-9C21H18N4O2
- Phenol, 2-(5-((2-methoxyphenyl)amino)-4-phenyl-4H-1,2,4-triazol-3-yl)-82619-93-0C21H18N4O2
- 2-Cyano-3-(4-cyanophenyl)-N-(4-morpholin-4-ylphenyl)prop-2-enamideC21H18N4O2
- 4-[4-(2-Oxo-1,2-dihydroquinolin-6-yl)piperazine-1-carbonyl]benzonitrile81839-76-1C21H18N4O2
- 1-Methyl-3-naphthalen-1-yl-1-[(3-phenyl-1,2,4-oxadiazol-5-yl)methyl]urea890328-40-2C21H18N4O2
- 6-Amino-4-(2-methoxyphenyl)-3-(4-methylphenyl)-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile448908-26-7C21H18N4O2
- Benzamide, 3-(acetylamino)-N-[4-(2-phenyldiazenyl)phenyl]-1390772-52-7C21H18N4O2
- (2-Cyano-2-{[2,5-dimethyl-1-(naphthalen-1-yl)-1H-pyrrol-3-yl]methylidene}acetyl)urea1087689-97-1C21H18N4O2
- 3-(1-Benzyl-1H-pyrazol-4-yl)-2-cyano-N-(3-methoxyphenyl)prop-2-enamide1331454-35-3C21H18N4O2
- 4-[5-[2-(6-Amino-3-pyridinyl)ethynyl]-6-ethyl-4-pyrimidinyl]-2-methylbenzoic acid1321613-44-8C21H18N4O2
- Methyl 4-((4-(2-methylimidazo[1,2-a]pyridin-3-yl)pyridin-2-yl)amino)benzoate1204527-16-1C21H18N4O2
- 2-Methyl-1-[1-(5-phenyl-1,2-oxazole-3-carbonyl)azetidin-3-yl]-1H-1,3-benzodiazole2380188-65-6C21H18N4O2
- 2-Benzyl-5-(quinoxalin-2-yl)-octahydropyrrolo[3,4-c]pyrrole-1,3-dione2415571-82-1C21H18N4O2
- N-(3-((6-(Prop-2-yn-1-yloxy)quinazolin-4-yl)amino)benzyl)acrylamide3037676-59-5C21H18N4O2
- N-(3-(((6-(Prop-2-yn-1-yloxy)quinazolin-4-yl)amino)methyl)phenyl)acrylamide3037703-22-0C21H18N4O2
- 4-Methyl-1-(4-nitrophenyl)-3,5-diphenyl-4,5-dihydro-1H-1,2,4-triazole89547-06-8C21H18N4O2
- N-Benzyl-2-[5-cyano-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidin-1-yl]acetamide950273-74-2C21H18N4O2
- N~1~,N~1~-Dimethyl-N~4~-(1-nitroacridin-9-yl)benzene-1,4-diamine17108-39-3C21H18N4O2
- N-(2-Methylphenyl)-2-[2-(3-phenyl-1,2,4-oxadiazol-5-yl)-1H-pyrrol-1-yl]acetamide1775421-61-8C21H18N4O2
- (4R,4'R)-2,2'-(1H-Pyrazole-3,5-diyl)bis(4-phenyl-4,5-dihydrooxazole)1207950-69-3C21H18N4O2
- 4-Ethoxy-N-(6-pyrrolo[2,3-c]pyridin-1-yl-3-pyridinyl)benzamide1841079-61-5C21H18N4O2
- 2-(4-(6-Amino-4-methylpyridin-3-yl)phenyl)-8-(hydroxymethyl)quinazolin-4(3H)-one1645286-55-0C21H18N4O2
- 5-(3-Methylquinoxalin-2-yl)-2-phenyl-octahydropyrrolo[3,4-c]pyrrole-1,3-dione2742059-92-1C21H18N4O2
- (9H-Fluoren-9-yl)methyl N-(3-cyano-1-ethyl-1H-pyrazol-4-yl)carbamate2770534-50-2C21H18N4O2
- (9H-Fluoren-9-yl)methyl N-(4-cyano-1,2-dimethyl-1H-imidazol-5-yl)carbamate2770555-62-7C21H18N4O2
- (4Z)-5-Methyl-4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)methylidene]-2-phenylpyrazol-3-oneC21H18N4O2
- 1H-Pyrazolo[4,3-c]pyridine-6-carboxylic acid,1-phenyl-4-(phenylamino)-,ethyl ester137368-76-4C21H18N4O2
Frequently asked questions
What is the molar mass of C21H18N4O2?
The molar mass of C21H18N4O2 is 358.40 g/mol, calculated from standard atomic weights for 21 carbon atoms, 18 hydrogen atoms, 4 nitrogen atoms and 2 oxygen atoms. The monoisotopic mass is 358.1430 Da.
How many compounds have the formula C21H18N4O2?
CompoundList lists 201 compounds with the molecular formula C21H18N4O2, including 1-(3-Methylbenzyl)-3-(pyridin-4-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione, 1-(4-Methylbenzyl)-3-(pyridin-4-ylmethyl)pyrido[3,2-d]pyrimidine-2,4(1H,3H)-dione, N-(5-(6-Methoxyimidazo[1,2-b]pyridazin-2-yl)-2-methylphenyl)benzamide. 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 C21H18N4O2?
C21H18N4O2 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.