Molecular formula
C21H21N3O3
394 compounds have this formula on CompoundList.
- Molar mass
- 363.42g/mol
- Monoisotopic mass
- 363.1583Da
- Atoms
- 48
- Elements
- 4
- Rings plus double bonds
- 13
The formula C21H21N3O3 describes a molecule made of 21 carbon atoms, 21 hydrogen atoms, 3 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 × 2169.41%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 215.82%1.008 × 21 = 21.168 g/mol
- N Nitrogen × 311.56%14.007 × 3 = 42.021 g/mol
- O Oxygen × 313.21%15.999 × 3 = 47.997 g/mol
Look up another formula
Compounds with the formula C21H21N3O3
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 101 to 200 of 394 compounds
![4-(4-Methylphenyl)-2-[2-(morpholin-4-yl)-2-oxoethyl]phthalazin-1(2H)-one chemical structure, C21H21N3O3, CAS 330831-43-1](/s/IVGGQJVMLZPZJQ-UHFFFAOYSA-N.svg)
4-(4-Methylphenyl)-2-[2-(morpholin-4-yl)-2-oxoethyl]phthalazin-1(2H)-one
CAS 330831-43-1C21H21N3O3
![4-(3,4-Dimethoxyphenyl)-3-methyl-5-(4-methylphenyl)-2,4-dihydropyrrolo[3,4-c]pyrazol-6-one chemical structure, C21H21N3O3, CAS 577763-86-1](/s/LEGHUQUONTUALA-UHFFFAOYSA-N.svg)
4-(3,4-Dimethoxyphenyl)-3-methyl-5-(4-methylphenyl)-2,4-dihydropyrrolo[3,4-c]pyrazol-6-one
CAS 577763-86-1C21H21N3O3
![1-[(4-Methoxyphenyl)methyl]-3-(3-phenylmethoxypyridin-2-yl)urea chemical structure, C21H21N3O3, CAS 1023511-68-3](/s/NXWDWBPTCGMHRZ-UHFFFAOYSA-N.svg)
1-[(4-Methoxyphenyl)methyl]-3-(3-phenylmethoxypyridin-2-yl)urea
CAS 1023511-68-3C21H21N3O3
![6-[(4-Methoxyphenyl)methyl]-4-(4-methylphenyl)-1H,2H,3H,4H,5H,6H,7H-pyrrolo[3,4-d]pyrimidine-2,5-dione chemical structure, C21H21N3O3, CAS 874594-28-2](/s/GQGVOUGHELZSRL-UHFFFAOYSA-N.svg)
6-[(4-Methoxyphenyl)methyl]-4-(4-methylphenyl)-1H,2H,3H,4H,5H,6H,7H-pyrrolo[3,4-d]pyrimidine-2,5-dione
CAS 874594-28-2C21H21N3O3
![2-(2-(Dimethylamino)ethyl)-7-methyl-1-(pyridin-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione chemical structure, C21H21N3O3, CAS 874397-64-5](/s/XXXJPLOPUZDNFM-UHFFFAOYSA-N.svg)
2-(2-(Dimethylamino)ethyl)-7-methyl-1-(pyridin-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione
CAS 874397-64-5C21H21N3O3
![2-{5-[(4-Methylphenoxy)methyl]furan-2-yl}-5-(piperidin-1-yl)-1,3-oxazole-4-carbonitrile chemical structure, C21H21N3O3, CAS 931704-20-0](/s/KDSYYUDCPUYAJP-UHFFFAOYSA-N.svg)
2-{5-[(4-Methylphenoxy)methyl]furan-2-yl}-5-(piperidin-1-yl)-1,3-oxazole-4-carbonitrile
CAS 931704-20-0C21H21N3O3
![1-[4-(2,3-Dimethoxyphenyl)-2-methyl-1,4-dihydropyrimido[1,2-a]benzimidazol-3-yl]ethanone chemical structure, C21H21N3O3, CAS 945173-99-9](/s/XYPRKAGJYQBUJV-UHFFFAOYSA-N.svg)
1-[4-(2,3-Dimethoxyphenyl)-2-methyl-1,4-dihydropyrimido[1,2-a]benzimidazol-3-yl]ethanone
CAS 945173-99-9C21H21N3O3
![3-(2-Hydroxyphenyl)-5-methyl-4-(3-propoxyphenyl)-4,5-dihydropyrrolo[3,4-c]pyrazol-6(1H)-one chemical structure, C21H21N3O3, CAS 874147-39-4](/s/BCVIOEPLUTVJQP-UHFFFAOYSA-N.svg)
3-(2-Hydroxyphenyl)-5-methyl-4-(3-propoxyphenyl)-4,5-dihydropyrrolo[3,4-c]pyrazol-6(1H)-one
CAS 874147-39-4C21H21N3O3
1-Amino-4-(cyclohexylamino)-9,10-dihydro-9,10-dioxoanthracene-2-carboxamide
CAS 3443-93-4C21H21N3O3
![2-[4-(Furan-2-carbonyl)piperazin-1-yl]-N-naphthalen-1-ylacetamide chemical structure, C21H21N3O3, CAS 835598-90-8](/s/VLGINIIHDCLJLI-UHFFFAOYSA-N.svg)
2-[4-(Furan-2-carbonyl)piperazin-1-yl]-N-naphthalen-1-ylacetamide
CAS 835598-90-8C21H21N3O3
![2-Amino-1'-ethyl-7,7-dimethyl-2',5-dioxospiro[6,8-dihydrochromene-4,3'-indole]-3-carbonitrile chemical structure, C21H21N3O3, CAS 665000-05-5](/s/RJNHKVMCBCOYIL-UHFFFAOYSA-N.svg)
2-Amino-1'-ethyl-7,7-dimethyl-2',5-dioxospiro[6,8-dihydrochromene-4,3'-indole]-3-carbonitrile
CAS 665000-05-5C21H21N3O3
![N-(Oxolan-2-ylmethyl)-N-[(2-oxo-1H-quinolin-3-yl)methyl]pyridine-3-carboxamide chemical structure, C21H21N3O3, CAS 838882-37-4](/s/RDBUXVRDUJERHU-UHFFFAOYSA-N.svg)
N-(Oxolan-2-ylmethyl)-N-[(2-oxo-1H-quinolin-3-yl)methyl]pyridine-3-carboxamide
CAS 838882-37-4C21H21N3O3
![4-[[(E)-2-Cyano-3-[4-(diethylamino)phenyl]prop-2-enoyl]amino]benzoic acid chemical structure, C21H21N3O3, CAS 402748-92-9](/s/JPTTYGFYSBCARQ-GHRIWEEISA-N.svg)
4-[[(E)-2-Cyano-3-[4-(diethylamino)phenyl]prop-2-enoyl]amino]benzoic acid
CAS 402748-92-9C21H21N3O3
2-(3-(3-Methoxyphenyl)-6-oxopyridazin-1(6H)-yl)-N-phenethylacetamide
CAS 922972-61-0C21H21N3O3
(Z)-2-(4-Benzylidene-2,5-dioxoimidazolidin-1-yl)-N-(4-isopropylphenyl)acetamide
CAS 868237-75-6C21H21N3O3
![N-Methyl-3-(2-methylprop-2-enoxy)-N-[(3-phenyl-1,2,4-oxadiazol-5-yl)methyl]benzamide chemical structure, C21H21N3O3, CAS 899523-68-3](/s/APZDMIGQRDUZHH-UHFFFAOYSA-N.svg)
N-Methyl-3-(2-methylprop-2-enoxy)-N-[(3-phenyl-1,2,4-oxadiazol-5-yl)methyl]benzamide
CAS 899523-68-3C21H21N3O3
![1-Allyl-N-[4-(dimethylamino)phenyl]-4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxamide chemical structure, C21H21N3O3, CAS 84088-44-8](/s/ZFHBMIBHWPUYOU-UHFFFAOYSA-N.svg)
1-Allyl-N-[4-(dimethylamino)phenyl]-4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxamide
CAS 84088-44-8C21H21N3O3
N-((4-Oxo-3,4-dihydrophthalazin-1-yl)methyl)-4-phenyltetrahydro-2H-pyran-4-carboxamide
CAS 1396877-59-0C21H21N3O3
Methyl 4-((3-(2-phenyl-1H-imidazol-1-yl)propyl)carbamoyl)benzoate
CAS 1421489-56-6C21H21N3O3
3-(3-Cyclopropyl-1,2,4-oxadiazol-5-yl)-1-(2-oxo-2-(2,4,5-trimethylphenyl)ethyl)pyridin-2(1H)-one
CAS 1396684-29-9C21H21N3O3
2-(1-(2-(1H-Indol-1-yl)acetyl)azetidin-3-yl)-3a,4,7,7a-tetrahydro-1H-isoindole-1,3(2H)-dione
CAS 2034381-54-7C21H21N3O3
![2-Methyl-4-[4-(2-oxo-2-pyrrolidin-1-ylethoxy)phenyl]phthalazin-1-one chemical structure, C21H21N3O3, CAS 701223-48-5](/s/WVUHHISSBHQBCF-UHFFFAOYSA-N.svg)
2-Methyl-4-[4-(2-oxo-2-pyrrolidin-1-ylethoxy)phenyl]phthalazin-1-one
CAS 701223-48-5C21H21N3O3
![2-Amino-7-methyl-2',5-dioxo-1'-propylspiro[7,8-dihydro-6H-chromene-4,3'-indole]-3-carbonitrile chemical structure, C21H21N3O3, CAS 674805-70-0](/s/QLUMOHBFVQLDDJ-UHFFFAOYSA-N.svg)
2-Amino-7-methyl-2',5-dioxo-1'-propylspiro[7,8-dihydro-6H-chromene-4,3'-indole]-3-carbonitrile
CAS 674805-70-0C21H21N3O3
![(2Z)-2-Cyano-N-(3-methoxyphenyl)-3-[4-(morpholin-4-yl)phenyl]prop-2-enamide chemical structure, C21H21N3O3, CAS 478017-02-6](/s/NBAMHXQYZJAMAG-LGMDPLHJSA-N.svg)
(2Z)-2-Cyano-N-(3-methoxyphenyl)-3-[4-(morpholin-4-yl)phenyl]prop-2-enamide
CAS 478017-02-6C21H21N3O3
- N1-(2-oxo-2,4,5,6-tetrahydro-1H-pyrrolo[3,2,1-ij]quinolin-8-yl)-N2-phenethyloxalamide898454-78-9C21H21N3O3
- N-(2-Methoxyphenethyl)-2-(6-oxo-3-phenylpyridazin-1(6H)-yl)acetamide922945-09-3C21H21N3O3
- N-(4-Ethoxyphenyl)-2-[3-(4-methylphenyl)-6-oxopyridazin-1-yl]acetamide923077-36-5C21H21N3O3
- 4-(4-Methoxyphenyl)-6-(4-methylbenzyl)-3,4,6,7-tetrahydro-1H-pyrrolo[3,4-d]pyrimidine-2,5-dione924031-81-2C21H21N3O3
- 2-{[2-(Furan-2-yl)ethyl]amino}-7-(4-methoxyphenyl)-7,8-dihydroquinazolin-5(6H)-one878977-09-4C21H21N3O3
- 3-(4-Methoxyphenyl)-N-[3-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)phenyl]propanamide899743-56-7C21H21N3O3
- 6-[2-(4-Methoxyphenyl)ethyl]-4-phenyl-1H,2H,3H,4H,5H,6H,7H-pyrrolo[3,4-d]pyrimidine-2,5-dione940250-94-2C21H21N3O3
- 8-{[1,1'-Biphenyl]-4-carbonyl}-3-methyl-1,3,8-triazaspiro[4.5]decane-2,4-dione923173-23-3C21H21N3O3
- N'-(3,3-Diphenylpropyl)-N-(5-methyl-1,2-oxazol-3-yl)ethanediamide941889-25-4C21H21N3O3
- N-(2-(3-(4-Methoxyphenyl)-6-oxopyridazin-1(6H)-yl)ethyl)-2-phenylacetamide921572-49-8C21H21N3O3
- 5-(Azepan-1-yl)-2-[5-(phenoxymethyl)furan-2-yl]-1,3-oxazole-4-carbonitrile931704-16-4C21H21N3O3
- N-{2-[(4-Methyl-1-piperazinyl)carbonyl]phenyl}-1-benzofuran-2-carboxamide1119435-97-0C21H21N3O3
- N-(2-Methoxyphenyl)-12-oxo-6,7,8,9,10,12-hexahydroazepino[2,1-b]quinazoline-3-carboxamide896633-79-7C21H21N3O3
- N-[(2,3-Dihydro-1,4-benzodioxin-2-yl)methyl]-N-methyl-3-(4-methylphenyl)-1H-pyrazole-5-carboxamide1268713-65-0C21H21N3O3
- Ethyl 4-[4-oxo-2-(pyrrolidin-1-yl)-3,4-dihydroquinazolin-3-yl]benzoate1111053-15-6C21H21N3O3
- 4-{[3-(4-tert-Butylphenyl)-1,2,4-oxadiazol-5-yl]methyl}-2H-1,4-benzoxazin-3(4H)-one1207019-97-3C21H21N3O3
- 2-(4-Ethyl-6-oxo-2-phenylpyrimidin-1(6H)-yl)-N-(3-methoxyphenyl)acetamide1260998-07-9C21H21N3O3
- N-(4-Methoxybenzyl)-2-[3-(4-methylphenyl)-6-oxopyridazin-1(6H)-yl]acetamide1291851-86-9C21H21N3O3
- (4-Hydroxy-8-methoxyquinolin-3-yl)(4-phenylpiperazin-1-yl)methanone1232792-24-3C21H21N3O3
- N~1~-(2,6-dimethylphenyl)-2-[3-(2-methoxyphenyl)-6-oxo-1(6H)-pyridazinyl]acetamide1351694-97-7C21H21N3O3
- N-((1-(Furan-3-carbonyl)piperidin-4-yl)methyl)quinoline-2-carboxamide1797648-67-9C21H21N3O3
- (E)-N'-(3-Allyl-2-hydroxybenzylidene)-3-(2-oxopyrrolidin-1-yl)benzohydrazide300591-05-3C21H21N3O3
- 8-Methoxy-3-[2-(2-methoxyphenyl)ethyl]-5-methylpyrimido[5,4-b]indol-4-one859134-21-7C21H21N3O3
- Ethyl 2,6-dimethyl-5-(3-(naphthalen-1-yl)ureido)nicotinate622789-06-4C21H21N3O3
- Pyrrolidine, 1-((4-oxo-2-(phenoxymethyl)-3(4H)-quinazolinyl)acetyl)-85063-14-5C21H21N3O3
- 1-Ethyl-N-(2-methoxydibenzofuran-3-yl)-3,5-dimethylpyrazole-4-carboxamide515831-95-5C21H21N3O3
- N-(4-Acetylphenyl)-1-[(2,5-dimethylphenoxy)methyl]pyrazole-3-carboxamide1005644-33-6C21H21N3O3
- 3-(2,4-Dioxo-1H-quinazolin-3-yl)-N-(1,2,3,4-tetrahydronaphthalen-1-yl)propanamide850781-73-6C21H21N3O3
- 5-Amino-9-(dimethylamino)-10-methylbenzo(a)phenoxazin-7-ium acetate62332-09-6C21H21N3O3
- 2-(4-Ethoxyphenyl)-N-[3-(6-methoxypyridazin-3-yl)phenyl]acetamide899954-12-2C21H21N3O3
- 2-[3-(4-Methoxyphenyl)-6-oxopyridazin-1-yl]-N-[(4-methylphenyl)methyl]acetamide941882-90-2C21H21N3O3
- 2-[3-(4-Ethoxyphenyl)-6-oxopyridazin-1-yl]-N-(3-methylphenyl)acetamide941972-44-7C21H21N3O3
- N-Benzyl-2-[3-(4-ethoxyphenyl)-6-oxopyridazin-1-yl]acetamide941972-47-0C21H21N3O3
- 2-[3-(3-Methoxyphenyl)-6-oxopyridazin-1-yl]-N-[(4-methylphenyl)methyl]acetamide899946-99-7C21H21N3O3
- 2-[3-(2,4-Dimethylphenyl)-6-oxopyridazin-1-yl]-N-(2-methoxyphenyl)acetamide941930-57-0C21H21N3O3
- 3-{[4-(2-Pyridin-2-ylethyl)piperazin-1-yl]carbonyl}-2H-chromen-2-one885728-83-6C21H21N3O3
- N-(3-Methoxyphenyl)-12-oxo-6,7,8,9,10,12-hexahydroazepino[2,1-b]quinazoline-3-carboxamide903173-29-5C21H21N3O3
- 4-Methoxy-1-(2-methylphenyl)-N-[(4-methylphenyl)methyl]-6-oxopyridazine-3-carboxamide1002255-07-3C21H21N3O3
- 3-({[(Cyclohexylamino)carbonyl]oxy}imino)-1-phenyl-1H-indol-2-one866143-55-7C21H21N3O3
- 2-(4-Methoxyphenyl)-N-[4-(5,6,7,8-tetrahydronaphthalen-2-yl)-1,2,5-oxadiazol-3-yl]acetamide912889-30-6C21H21N3O3
- N1-benzyl-N2-(1-methyl-2-oxo-2,4,5,6-tetrahydro-1H-pyrrolo[3,2,1-ij]quinolin-8-yl)oxalamide898411-36-4C21H21N3O3
- N1-benzyl-N2-(3-oxo-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-9-yl)oxalamide898427-62-8C21H21N3O3
- N'-(4-Methylphenyl)-N-{2-oxo-1-azatricyclo[7.3.1.0^{5,13}]trideca-5,7,9(13)-trien-7-yl}ethanediamide898438-36-3C21H21N3O3
- N1-(3-oxo-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-9-yl)-N2-(o-tolyl)oxalamide898438-41-0C21H21N3O3
- 4-(3-(3-Methoxyphenyl)-6-oxopyridazin-1(6H)-yl)-N-phenylbutanamide953258-90-7C21H21N3O3
- 2-(4-Methylphenoxy)-N-[4-(5,6,7,8-tetrahydronaphthalen-2-yl)-1,2,5-oxadiazol-3-yl]acetamide912910-59-9C21H21N3O3
- 1H-Indol-2-yl{4-[(3-methoxyphenyl)carbonyl]piperazin-1-yl}methanone952001-19-3C21H21N3O3
- 1H-Indol-2-yl{4-[(4-methoxyphenyl)carbonyl]piperazin-1-yl}methanone951942-22-6C21H21N3O3
- 2-[4-(2-Methoxybenzoyl)piperazine-1-carbonyl]-1H-indole951978-40-8C21H21N3O3
- N-(2-((6-(4-Ethoxyphenyl)pyridazin-3-yl)oxy)ethyl)benzamide920157-75-1C21H21N3O3
- 2-(2,3-Dioxo-4-phenyl-1,2,3,4-tetrahydropyrazin-1-yl)-N-(2,4,6-trimethylphenyl)acetamide904525-85-5C21H21N3O3
- 2-[4-(3,4-Dimethylphenyl)-2,3-dioxo-1,2,3,4-tetrahydropyrazin-1-yl]-N-(3-methylphenyl)acetamide950283-64-4C21H21N3O3
- N-[2-(4-Methoxyphenyl)ethyl]-2-(6-oxo-4-phenyl-1,6-dihydropyrimidin-1-yl)acetamide1058226-23-5C21H21N3O3
- N-[2-(2-Methoxyphenyl)ethyl]-2-(6-oxo-4-phenyl-1,6-dihydropyrimidin-1-yl)acetamide1058226-29-1C21H21N3O3
- N-[2-(3-Methoxyphenyl)ethyl]-2-(6-oxo-4-phenyl-1,6-dihydropyrimidin-1-yl)acetamide1060201-13-9C21H21N3O3
- 2-[4-(4-Methoxyphenyl)-6-oxo-1,6-dihydropyrimidin-1-yl]-N-(2-phenylethyl)acetamide1058437-43-6C21H21N3O3
- N-(3,4-Dimethylphenyl)-4-methoxy-1-(4-methylphenyl)-6-oxo-1,6-dihydropyridazine-3-carboxamide946380-30-9C21H21N3O3
- 4-Ethoxy-N-{2-[(6-phenylpyridazin-3-yl)oxy]ethyl}benzamide920180-63-8C21H21N3O3
- N-Cyclopentyl-3-(3-methoxyphenyl)-4-oxo-3,4-dihydroquinazoline-7-carboxamide1144452-28-7C21H21N3O3
- 2-Cycloheptyl-1,3-dioxo-N-(pyridin-2-yl)-2,3-dihydro-1H-isoindole-5-carboxamide1144475-48-8C21H21N3O3
- N-(5-Cyclohexyl-1,3,4-oxadiazol-2-yl)-4-phenoxybenzamide922105-65-5C21H21N3O3
- 2-{5-[(3-Methylphenoxy)methyl]furan-2-yl}-5-(piperidin-1-yl)-1,3-oxazole-4-carbonitrile946309-35-9C21H21N3O3
- 4-[3-(4-Ethoxyphenyl)-1,2,4-oxadiazol-5-yl]-1-(4-methylphenyl)pyrrolidin-2-one946243-58-9C21H21N3O3
- 1-[4-(2-Methoxyphenyl)piperazin-1-yl]isoquinoline-4-carboxylic acid1030102-15-8C21H21N3O3
- 4-(4-Hydroxyphenyl)-1-methyl-6-[(4-methylphenyl)methyl]-1H,2H,3H,4H,5H,6H,7H-pyrrolo[3,4-d]pyrimidine-2,5-dione1203001-98-2C21H21N3O3
- N-(4-Methoxyphenyl)-2-{[6-methyl-2-(4-methylphenyl)pyrimidin-4-yl]oxy}acetamide1113107-79-1C21H21N3O3
- N-(2-Methoxyphenyl)-2-{[6-methyl-2-(4-methylphenyl)pyrimidin-4-yl]oxy}acetamide1031977-84-0C21H21N3O3
- 6-({[2-(Pyridin-2-yl)quinolin-4-yl]carbonyl}amino)hexanoic acid1219561-45-1C21H21N3O3
- 6-Methoxy-1-(4-methylphenyl)-4-oxo-N-(2-phenylethyl)-1,4-dihydropyridazine-3-carboxamide1251704-81-0C21H21N3O3
- N-(2-Methoxyphenyl)-2-(10-oxo-3,4-dihydrobenzo[b][1,6]naphthyridin-2(1H,5H,10H)-yl)acetamide1251558-53-8C21H21N3O3
- 2-Oxo-N-((1-(pyridin-2-yl)piperidin-4-yl)methyl)-2H-chromene-3-carboxamide1235267-25-0C21H21N3O3
- 1-(4-Benzyl-3-oxo-3,4-dihydroquinoxalin-2-yl)piperidine-4-carboxylic acid1242853-78-6C21H21N3O3
- N-Benzyl-2-(3-(4-methoxyphenyl)-6-oxopyridazin-1(6H)-yl)-N-methylacetamide1224160-69-3C21H21N3O3
- (4-Hydroxy-6-methoxyquinolin-3-yl)(4-phenylpiperazin-1-yl)methanone1232808-33-1C21H21N3O3
- N-(2,3-Dihydro-1,4-benzodioxin-6-yl)-1-phenyl-3-(propan-2-yl)-1H-pyrazole-5-carboxamide1282140-84-4C21H21N3O3
- 6-({[2-(Pyridin-4-yl)quinolin-4-yl]carbonyl}amino)hexanoic acid1351700-87-2C21H21N3O3
Frequently asked questions
What is the molar mass of C21H21N3O3?
The molar mass of C21H21N3O3 is 363.42 g/mol, calculated from standard atomic weights for 21 carbon atoms, 21 hydrogen atoms, 3 nitrogen atoms and 3 oxygen atoms. The monoisotopic mass is 363.1583 Da.
How many compounds have the formula C21H21N3O3?
CompoundList lists 394 compounds with the molecular formula C21H21N3O3, including 4-(4-Methylphenyl)-2-[2-(morpholin-4-yl)-2-oxoethyl]phthalazin-1(2H)-one, 4-(3,4-Dimethoxyphenyl)-3-methyl-5-(4-methylphenyl)-2,4-dihydropyrrolo[3,4-c]pyrazol-6-one, 1-[(4-Methoxyphenyl)methyl]-3-(3-phenylmethoxypyridin-2-yl)urea. 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 C21H21N3O3?
C21H21N3O3 has a degree of unsaturation of 13. 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.