Molecular formula
C21H20ClN3O2
115 compounds have this formula on CompoundList.
- Molar mass
- 381.86g/mol
- Monoisotopic mass
- 381.1244Da
- Atoms
- 47
- Elements
- 5
- Rings plus double bonds
- 13
The formula C21H20ClN3O2 describes a molecule made of 21 carbon atoms, 20 hydrogen atoms, 1 chlorine atom, 3 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 × 2166.05%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 205.28%1.008 × 20 = 20.160 g/mol
- Cl Chlorine × 19.28%35.45 × 1 = 35.450 g/mol
- N Nitrogen × 311.00%14.007 × 3 = 42.021 g/mol
- O Oxygen × 28.38%15.999 × 2 = 31.998 g/mol
Look up another formula
Compounds with the formula C21H20ClN3O2
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 115 compounds
![1-{[3-(2-Chlorophenyl)-5-methyl-4-isoxazolyl]carbonyl}-4-phenylpiperazine chemical structure, C21H20ClN3O2, CAS 331847-86-0](/s/IBRKWBCIUYFGCA-UHFFFAOYSA-N.svg)
1-{[3-(2-Chlorophenyl)-5-methyl-4-isoxazolyl]carbonyl}-4-phenylpiperazine
CAS 331847-86-0C21H20ClN3O2
3-Chloro-1-(2-methylphenyl)-4-(4-phenylpiperazin-1-yl)-1H-pyrrole-2,5-dione
CAS 303034-94-8C21H20ClN3O2
![(E)-2-Acetamido-3-(4-chlorophenyl)-N-[2-(1H-indol-3-yl)ethyl]prop-2-enamide chemical structure, C21H20ClN3O2, CAS 1164554-48-6](/s/ZXJXQIFFWYWWJD-UDWIEESQSA-N.svg)
(E)-2-Acetamido-3-(4-chlorophenyl)-N-[2-(1H-indol-3-yl)ethyl]prop-2-enamide
CAS 1164554-48-6C21H20ClN3O2
3-(4-Benzylpiperazin-1-yl)-4-chloro-1-phenyl-1H-pyrrole-2,5-dione
CAS 459419-22-8C21H20ClN3O2
methanone chemical structure, C21H20ClN3O2, CAS 477712-29-1](/s/UDWSFTXQSIJEAB-UHFFFAOYSA-N.svg)
[5-(4-Chlorophenyl)-1-(4-methylphenyl)-1H-pyrazol-3-yl](morpholino)methanone
CAS 477712-29-1C21H20ClN3O2
![1-[4-(2-Chlorophenyl)piperazin-1-yl]-2-(2-methyl-1H-indol-3-yl)ethane-1,2-dione chemical structure, C21H20ClN3O2, CAS 852368-55-9](/s/MMLPHNRWDBDVGW-UHFFFAOYSA-N.svg)
1-[4-(2-Chlorophenyl)piperazin-1-yl]-2-(2-methyl-1H-indol-3-yl)ethane-1,2-dione
CAS 852368-55-9C21H20ClN3O2
![1-[4-(3-Chlorophenyl)piperazin-1-yl]-2-(2-methyl-1H-indol-3-yl)ethane-1,2-dione chemical structure, C21H20ClN3O2, CAS 852368-56-0](/s/GBPXMBZRMHNOHE-UHFFFAOYSA-N.svg)
1-[4-(3-Chlorophenyl)piperazin-1-yl]-2-(2-methyl-1H-indol-3-yl)ethane-1,2-dione
CAS 852368-56-0C21H20ClN3O2
![N-(2-Chlorophenyl)-2-[methyl-[2-(naphthalen-1-ylamino)-2-oxoethyl]amino]acetamide chemical structure, C21H20ClN3O2, CAS 791129-46-9](/s/AIRCKNQDAQMBNX-UHFFFAOYSA-N.svg)
N-(2-Chlorophenyl)-2-[methyl-[2-(naphthalen-1-ylamino)-2-oxoethyl]amino]acetamide
CAS 791129-46-9C21H20ClN3O2
1-(4-Chlorophenyl)-N-((4-oxo-3,4-dihydrophthalazin-1-yl)methyl)cyclopentanecarboxamide
CAS 899985-09-2C21H20ClN3O2
![N-[2-(4-Chlorophenyl)ethyl]-2-[3-(4-methylphenyl)-6-oxopyridazin-1-yl]acetamide chemical structure, C21H20ClN3O2, CAS 898221-00-6](/s/WCMWTTAFUDPTTQ-UHFFFAOYSA-N.svg)
N-[2-(4-Chlorophenyl)ethyl]-2-[3-(4-methylphenyl)-6-oxopyridazin-1-yl]acetamide
CAS 898221-00-6C21H20ClN3O2
4-(4-Chlorophenyl)-2-(2-oxo-2-piperidin-1-ylethyl)phthalazin-1-one
CAS 684234-46-6C21H20ClN3O2
![1-(5-Chloro-2-methoxyphenyl)-4-[1-(prop-2-en-1-yl)-1H-1,3-benzodiazol-2-yl]pyrrolidin-2-one chemical structure, C21H20ClN3O2, CAS 847397-48-2](/s/JJEPYUQVXQSZKZ-UHFFFAOYSA-N.svg)
1-(5-Chloro-2-methoxyphenyl)-4-[1-(prop-2-en-1-yl)-1H-1,3-benzodiazol-2-yl]pyrrolidin-2-one
CAS 847397-48-2C21H20ClN3O2
![N-[1-(4-Chlorobenzyl)-2-oxo-1,2-dihydro-3-pyridinyl]-N'-(2,6-dimethylphenyl)urea chemical structure, C21H20ClN3O2, CAS 338755-32-1](/s/MDBWOWOHPPDZJM-UHFFFAOYSA-N.svg)
N-[1-(4-Chlorobenzyl)-2-oxo-1,2-dihydro-3-pyridinyl]-N'-(2,6-dimethylphenyl)urea
CAS 338755-32-1C21H20ClN3O2
Cdk8-IN-12
CAS 2613307-67-6C21H20ClN3O2
N-(2-Chlorobenzyl)-2-(6-oxo-3-(p-tolyl)pyridazin-1(6H)-yl)propanamide
CAS 1203235-58-8C21H20ClN3O2
![1-[5-(2-Chloro-8-methylquinolin-3-yl)-3-(furan-2-yl)-4,5-dihydro-1H-pyrazol-1-yl]butan-1-one chemical structure, C21H20ClN3O2, CAS 932138-86-8](/s/LNFWIANCUDTFFT-UHFFFAOYSA-N.svg)
1-[5-(2-Chloro-8-methylquinolin-3-yl)-3-(furan-2-yl)-4,5-dihydro-1H-pyrazol-1-yl]butan-1-one
CAS 932138-86-8C21H20ClN3O2
N-(3-Chloro-4-methylphenyl)-3-(morpholine-4-carbonyl)quinolin-4-amine
CAS 1021225-33-1C21H20ClN3O2
N-(3-(3-(4-Chlorophenyl)-6-oxopyridazin-1(6H)-yl)propyl)-3-methylbenzamide
CAS 1021090-92-5C21H20ClN3O2
N-(2-Chlorophenyl)-4-(6-oxo-3-(p-tolyl)pyridazin-1(6H)-yl)butanamide
CAS 946322-40-3C21H20ClN3O2
1-(4-Chlorophenyl)-3-(2-(furan-2-yl)-2-(indolin-1-yl)ethyl)urea
CAS 898432-41-2C21H20ClN3O2
4-(3-(3-Chlorophenyl)-1,2,4-oxadiazol-5-yl)-1-(4-isopropylphenyl)pyrrolidin-2-one
CAS 941998-17-0C21H20ClN3O2
![Isopropyl 4-(3-chlorophenyl)-2-methyl-1,4-dihydropyrimido[1,2-a]benzimidazole-3-carboxylate chemical structure, C21H20ClN3O2, CAS 879078-89-4](/s/SDHJBHNFMUHUDP-UHFFFAOYSA-N.svg)
Isopropyl 4-(3-chlorophenyl)-2-methyl-1,4-dihydropyrimido[1,2-a]benzimidazole-3-carboxylate
CAS 879078-89-4C21H20ClN3O2
![[2-[6-(3-Chlorophenyl)-4-methyl-3-pyridinyl]pyrrolidin-1-yl]-(5-methyl-1,2-oxazol-3-yl)methanone chemical structure, C21H20ClN3O2, CAS 1332336-39-6](/s/MRWOIHZAYHSOIU-UHFFFAOYSA-N.svg)
[2-[6-(3-Chlorophenyl)-4-methyl-3-pyridinyl]pyrrolidin-1-yl]-(5-methyl-1,2-oxazol-3-yl)methanone
CAS 1332336-39-6C21H20ClN3O2
![1-[5-(2-Chloro-8-methylquinolin-3-yl)-3-(furan-2-yl)-4,5-dihydro-1H-pyrazol-1-yl]-2-methylpropan-1-one chemical structure, C21H20ClN3O2, CAS 923211-52-3](/s/IIZJXLHGTGPDMM-UHFFFAOYSA-N.svg)
1-[5-(2-Chloro-8-methylquinolin-3-yl)-3-(furan-2-yl)-4,5-dihydro-1H-pyrazol-1-yl]-2-methylpropan-1-one
CAS 923211-52-3C21H20ClN3O2
- 4-(4-Chlorophenyl)-2-(3-oxo-3-pyrrolidin-1-ylpropyl)phthalazin-1-one694460-13-4C21H20ClN3O2
- [4-(5-Chloro-2-methylphenyl)piperazin-1-yl]-(5-phenyl-1,2-oxazol-3-yl)methanone712348-19-1C21H20ClN3O2
- 2-(3-(4-Chlorophenyl)-6-oxopyridazin-1(6H)-yl)-N-(4-isopropylphenyl)acetamide941882-82-2C21H20ClN3O2
- 4-(4-Chlorophenyl)-6-(3-phenylpropyl)-3,4,6,7-tetrahydro-1H-pyrrolo[3,4-d]pyrimidine-2,5-dione930016-98-1C21H20ClN3O2
- 1-(4-Chlorophenyl)-N-(4-(3-methyl-1,2,4-oxadiazol-5-yl)phenyl)cyclopentanecarboxamide1226440-32-9C21H20ClN3O2
- 1-(5-(2-Chloro-7-methylquinolin-3-yl)-3-(furan-2-yl)-4,5-dihydro-1H-pyrazol-1-yl)-2-methylpropan-1-one923132-10-9C21H20ClN3O2
- 4-(2-Chlorophenyl)-6-(3-phenylpropyl)-3,4,6,7-tetrahydro-1H-pyrrolo[3,4-d]pyrimidine-2,5-dione946325-07-1C21H20ClN3O2
- 7-(1,3-Benzodioxol-5-yl)-3-[(4-benzylpiperazin-1-yl)carbonyl]pyrazolo[1,5-a]pyrimidine1251674-11-9C21H20ClN3O2
- N-[(2-Chlorophenyl)methyl]-2-{[6-methyl-2-(4-methylphenyl)pyrimidin-4-yl]oxy}acetamide1251626-06-8C21H20ClN3O2
- N-(2-Chlorobenzyl)-4-(6-oxo-4-phenylpyrimidin-1(6H)-yl)butanamide1226456-36-5C21H20ClN3O2
- 2-(2-Amino-5-(4-chlorophenyl)pyrimidin-4-yl)-5-((3-methylbut-2-en-1-yl)oxy)phenol903186-33-4C21H20ClN3O2
- 4-{[4-(3-Chlorophenyl)piperazino]carbonyl}-2-methyl-1(2H)-isoquinolinone440662-18-0C21H20ClN3O2
- N-(2-Chloro-5-(2-methyl-4-oxoquinazolin-3(4H)-yl)phenyl)cyclopentanecarboxamide899980-12-2C21H20ClN3O2
- N-(3-Chloro-2-methylphenyl)-2-[3-(3,4-dimethylphenyl)-6-oxopyridazin-1-yl]acetamide922934-14-3C21H20ClN3O2
- N-(4-Chlorobenzyl)-2-(3-(3,4-dimethylphenyl)-6-oxopyridazin-1(6H)-yl)acetamide922865-34-7C21H20ClN3O2
- 1-(4-Chlorophenyl)-N-(2-methoxyphenyl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxamide899959-94-5C21H20ClN3O2
- 1-(3-Chlorophenyl)-3-(2-(furan-2-yl)-2-(indolin-1-yl)ethyl)urea898416-03-0C21H20ClN3O2
- N-(2-(3-(4-Chlorophenyl)-6-oxopyridazin-1(6H)-yl)ethyl)-3,4-dimethylbenzamide921851-42-5C21H20ClN3O2
- N-(2-Chloro-4-methylphenyl)-2-[3-(3,4-dimethylphenyl)-6-oxopyridazin-1(6H)-yl]acetamide891393-78-5C21H20ClN3O2
- (4-((2-Chloro-4-methylphenyl)amino)quinolin-3-yl)(morpholino)methanone1040676-80-9C21H20ClN3O2
- N-(4-Chlorophenyl)-2-{[2-(pyrrolidin-1-yl)quinolin-8-yl]oxy}acetamide921575-74-8C21H20ClN3O2
- Ethyl 4-[(3-cyano-6-ethylquinolin-4-yl)amino]benzoate hydrochloride1323535-03-0C21H20ClN3O2
- N-(5-Chloro-2-methylphenyl)-2-(3-(3,4-dimethylphenyl)-6-oxopyridazin-1(6H)-yl)acetamide1252916-56-5C21H20ClN3O2
- N-(3-Chlorophenyl)-2-(3-(3,4-dimethylphenyl)-6-oxopyridazin-1(6H)-yl)-N-methylacetamide1252922-95-4C21H20ClN3O2
- N-(2-Chloro-4-methylphenyl)-2-(10-oxo-3,4,5,10-tetrahydrobenzo[b][1,6]naphthyridin-2(1H)-yl)acetamide1251688-35-3C21H20ClN3O2
- N-(3-Chloro-2-methylphenyl)-2-(10-oxo-3,4,5,10-tetrahydrobenzo[b][1,6]naphthyridin-2(1H)-yl)acetamide1251622-46-4C21H20ClN3O2
- 2-{[2-(4-Chlorophenyl)-6-methylpyrimidin-4-yl]oxy}-N-(2-ethylphenyl)acetamide1251551-22-0C21H20ClN3O2
- 2-Chloro-N-((3-cyclopentyl-4-oxo-3,4-dihydrophthalazin-1-yl)methyl)benzamide1396867-14-3C21H20ClN3O2
- N-(2-Chlorobenzyl)-12-oxo-6,7,8,9,10,12-hexahydroazepino[2,1-b]quinazoline-3-carboxamide903136-17-4C21H20ClN3O2
- 1-(4-Chlorobenzyl)-N-cyclopentyl-2-oxo-1,2-dihydro-1,8-naphthyridine-3-carboxamide1005307-53-8C21H20ClN3O2
- 2-(3-(4-Chlorophenyl)-6-oxopyridazin-1(6H)-yl)-N-mesitylacetamide941929-97-1C21H20ClN3O2
- N-(4-Chlorophenyl)-1-(4-methoxyphenyl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxamide899750-41-5C21H20ClN3O2
- 4-(3-(4-Chlorophenyl)-1,2,4-oxadiazol-5-yl)-1-(4-isopropylphenyl)pyrrolidin-2-one941892-32-6C21H20ClN3O2
- 8-(2-Chlorobenzoyl)-3-(3-methylphenyl)-1,4,8-triazaspiro[4.5]dec-3-en-2-one932984-55-9C21H20ClN3O2
- 3-[4-(3-Chlorobenzoyl)piperazine-1-carbonyl]-1-methyl-1H-indole1081127-68-5C21H20ClN3O2
- 2-{[2-(4-Chlorophenyl)-6-methylpyrimidin-4-yl]oxy}-N-(2,3-dimethylphenyl)acetamide1251672-15-7C21H20ClN3O2
- N-(3-Chloro-4-methylphenyl)-2-(10-oxo-3,4-dihydrobenzo[b][1,6]naphthyridin-2(1H,5H,10H)-yl)acetamide1251615-41-4C21H20ClN3O2
- 1-[(4-Chlorophenyl)acetyl]-4-(3-phenyl-1,2,4-oxadiazol-5-yl)piperidine1358959-71-3C21H20ClN3O2
- 5-Chloro-N-[4-[[3-(tetrahydro-2H-pyran-4-yl)-2-pyridinyl]oxy]phenyl]-2-pyridinamine1231923-40-2C21H20ClN3O2
- 2-[3-(4-Chlorophenyl)-1,2,4-oxadiazol-5-yl]-N-cyclohexylbenzamide831245-49-9C21H20ClN3O2
- 1-[(4-Chloro-3-methylphenoxy)methyl]-N-(2,3-dihydro-1H-inden-5-yl)pyrazole-3-carboxamide1005664-57-2C21H20ClN3O2
- 1-(4-Chlorophenyl)-N-(3-methoxyphenyl)-1H,2H,3H,4H-pyrrolo[1,2-a]pyrazine-2-carboxamide899750-04-0C21H20ClN3O2
- 1-(4-Chlorophenyl)-N-(4-methoxyphenyl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxamide900001-69-6C21H20ClN3O2
- N-(3-Chlorophenyl)-1-(4-methoxyphenyl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxamide900002-18-8C21H20ClN3O2
- 4-(3-(4-Chlorophenyl)-6-oxopyridazin-1(6H)-yl)-N-(p-tolyl)butanamide946266-27-9C21H20ClN3O2
- N-(4-Chlorophenyl)-4-(6-oxo-3-(p-tolyl)pyridazin-1(6H)-yl)butanamide946267-65-8C21H20ClN3O2
- N-(2-(3-(4-Chlorophenyl)-6-oxopyridazin-1(6H)-yl)ethyl)-3,5-dimethylbenzamide921851-97-0C21H20ClN3O2
- (2-Chlorophenyl){4-[(1-methyl-1H-indol-3-yl)carbonyl]piperazin-1-yl}methanone1081113-78-1C21H20ClN3O2
- N-[2-(5-Chloro-1H-indol-3-yl)ethyl]-2-(5-methoxy-1H-indol-1-yl)acetamide1144472-64-9C21H20ClN3O2
- N~1~-[5-(3-chlorophenyl)-3-cyclopropyl-1H-pyrazol-4-yl]-2-(3-methoxyphenyl)acetamide1190838-40-4C21H20ClN3O2
- N-(3-Chloro-4-methylphenyl)-2-{[6-methyl-2-(4-methylphenyl)pyrimidin-4-yl]oxy}acetamide1031977-88-4C21H20ClN3O2
- 5-Chloro-N-[2-(1-piperidinylcarbonyl)phenyl]-1H-indole-2-carboxamide1208620-13-6C21H20ClN3O2
- 2-{[2-(4-Chlorophenyl)-6-methylpyrimidin-4-yl]oxy}-N-(2,5-dimethylphenyl)acetamide1251582-80-5C21H20ClN3O2
- N-(4-Chlorobenzyl)-2-((6-methyl-2-(p-tolyl)pyrimidin-4-yl)oxy)acetamide1251616-11-1C21H20ClN3O2
- N-Benzyl-2-(8-chloro-10-oxo-3,4-dihydrobenzo[b][1,6]naphthyridin-2(1H,5H,10H)-yl)acetamide1226459-21-7C21H20ClN3O2
- 2-[3-(2-Chlorophenyl)-6-oxopyridazin-1(6H)-yl]-N-[4-(propan-2-yl)phenyl]acetamide1324084-21-0C21H20ClN3O2
- 2-(4-Chloro-1H-indol-1-yl)-N-[1-(2-methoxyethyl)-1H-indol-4-yl]acetamide1324070-81-6C21H20ClN3O2
- [3-(3-Chlorophenyl)-1-methyl-1H-pyrazol-5-yl](2-phenylmorpholin-4-yl)methanone1374547-35-9C21H20ClN3O2
- N-[2-(5-Chloro-1H-indol-3-yl)ethyl]-2-(4-methoxy-1H-indol-1-yl)acetamide1374525-03-7C21H20ClN3O2
- 2-(6-Chloro-1H-indol-1-yl)-N-[1-(2-methoxyethyl)-1H-indol-4-yl]acetamide1574494-68-0C21H20ClN3O2
- (4-(1H-Pyrrol-1-yl)phenyl)(4-((3-chloropyridin-2-yl)oxy)piperidin-1-yl)methanone1448068-87-8C21H20ClN3O2
- 5-{1-[(2-Chlorophenyl)acetyl]pyrrolidin-2-yl}-3-(4-methylphenyl)-1,2,4-oxadiazole1798633-77-8C21H20ClN3O2
- 8-Chloro-2-(2-phenylbutanoyl)-3,4-dihydro-1H-dipyrido[1,2-a:4',3'-d]pyrimidin-11(2H)-one2034267-53-1C21H20ClN3O2
- N-(4-Chlorobenzyl)-3-(quinolin-2-yloxy)pyrrolidine-1-carboxamide2034494-06-7C21H20ClN3O2
- (4-(1H-Pyrrol-1-yl)phenyl)(4-((3-chloropyridin-4-yl)oxy)piperidin-1-yl)methanone2034471-40-2C21H20ClN3O2
- 5-Chloro-2-methoxy-N-(2-(5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-2-yl)phenyl)benzamide2034470-86-3C21H20ClN3O2
- 3-((3-Chloropyridin-4-yl)oxy)-N-(naphthalen-1-ylmethyl)pyrrolidine-1-carboxamide2034432-72-7C21H20ClN3O2
- 3-(1-(2-(2-Chlorophenyl)acetyl)piperidin-3-yl)quinazolin-4(3H)-one2034534-00-2C21H20ClN3O2
- 2-(2-Chlorophenoxy)-N-(2-(5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-2-yl)phenyl)acetamide2034567-08-1C21H20ClN3O2
- N-Benzyl-2-[3-(4-chlorophenyl)-6-oxo-1,6-dihydropyridazin-1-yl]-N-ethylacetamide2330218-71-6C21H20ClN3O2
- (Z)-N-[(4-Chlorophenyl)methyl]-2-cyano-3-(4-morpholin-4-ylphenyl)prop-2-enamide477973-90-3C21H20ClN3O2
- 2-Chloro-4-[4-(4-methoxyphenyl)piperazine-1-carbonyl]quinoline870759-59-4C21H20ClN3O2
- 8-(3-Chlorobenzoyl)-3-(3-methylphenyl)-1,4,8-triazaspiro[4.5]dec-3-en-2-one933015-86-2C21H20ClN3O2
- (4-Chlorophenyl){4-[(1-methyl-1H-indol-2-yl)carbonyl]piperazin-1-yl}methanone1081122-46-4C21H20ClN3O2
- N-(3-Chlorophenyl)-4-oxo-4-(1,3,4,5-tetrahydro-2H-pyrido[4,3-b]indol-2-yl)butanamide1081145-88-1C21H20ClN3O2
- (3-Chlorophenyl){4-[(1-methyl-1H-indol-2-yl)carbonyl]piperazin-1-yl}methanone1081147-41-2C21H20ClN3O2
Frequently asked questions
What is the molar mass of C21H20ClN3O2?
The molar mass of C21H20ClN3O2 is 381.86 g/mol, calculated from standard atomic weights for 21 carbon atoms, 20 hydrogen atoms, 1 chlorine atom, 3 nitrogen atoms and 2 oxygen atoms. The monoisotopic mass is 381.1244 Da.
How many compounds have the formula C21H20ClN3O2?
CompoundList lists 115 compounds with the molecular formula C21H20ClN3O2, including 1-{[3-(2-Chlorophenyl)-5-methyl-4-isoxazolyl]carbonyl}-4-phenylpiperazine, 3-Chloro-1-(2-methylphenyl)-4-(4-phenylpiperazin-1-yl)-1H-pyrrole-2,5-dione, (E)-2-Acetamido-3-(4-chlorophenyl)-N-[2-(1H-indol-3-yl)ethyl]prop-2-enamide. 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 C21H20ClN3O2?
C21H20ClN3O2 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.