Molecular formula
C21H19FN4O3S
72 compounds have this formula on CompoundList.
- Molar mass
- 426.47g/mol
- Monoisotopic mass
- 426.1162Da
- Atoms
- 49
- Elements
- 6
- Rings plus double bonds
- 14
The formula C21H19FN4O3S describes a molecule made of 21 carbon atoms, 19 hydrogen atoms, 1 fluorine atom, 4 nitrogen atoms, 3 oxygen atoms and 1 sulfur 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 × 2159.14%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 194.49%1.008 × 19 = 19.152 g/mol
- F Fluorine × 14.45%18.998 × 1 = 18.998 g/mol
- N Nitrogen × 413.14%14.007 × 4 = 56.028 g/mol
- O Oxygen × 311.25%15.999 × 3 = 47.997 g/mol
- S Sulfur × 17.52%32.06 × 1 = 32.060 g/mol
Look up another formula
Compounds with the formula C21H19FN4O3S
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 72 of 72 compounds
![1-(2-Fluorophenyl)-5-[[4-(4-morpholinyl)anilino]methylidene]-2-sulfanylidene-1,3-diazinane-4,6-dione chemical structure, C21H19FN4O3S, CAS 509113-49-9](/s/BJXVUEPQHUUWNO-UHFFFAOYSA-N.svg)
1-(2-Fluorophenyl)-5-[[4-(4-morpholinyl)anilino]methylidene]-2-sulfanylidene-1,3-diazinane-4,6-dione
CAS 509113-49-9C21H19FN4O3S
![3-((4-Fluorophenyl)sulfonyl)-2-imino-10-methyl-1-propyl-1H-dipyrido[1,2-a:2',3'-d]pyrimidin-5(2H)-one chemical structure, C21H19FN4O3S, CAS 844836-26-6](/s/OMWXFJSPQORYQO-UHFFFAOYSA-N.svg)
3-((4-Fluorophenyl)sulfonyl)-2-imino-10-methyl-1-propyl-1H-dipyrido[1,2-a:2',3'-d]pyrimidin-5(2H)-one
CAS 844836-26-6C21H19FN4O3S
![N-(4-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide chemical structure, C21H19FN4O3S, CAS 888437-55-6](/s/XKVABOGRKCIWGA-UHFFFAOYSA-N.svg)
N-(4-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide
CAS 888437-55-6C21H19FN4O3S
![N-(2-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide chemical structure, C21H19FN4O3S, CAS 888437-39-6](/s/ZZIMCCDCROQCBE-UHFFFAOYSA-N.svg)
N-(2-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide
CAS 888437-39-6C21H19FN4O3S
![N-(3-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide chemical structure, C21H19FN4O3S, CAS 888437-47-6](/s/NCNQXIVCRVSMQX-UHFFFAOYSA-N.svg)
N-(3-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide
CAS 888437-47-6C21H19FN4O3S
![2-Fluoro-4-(2-methyl-8-((3-(methylsulfonyl)benzyl)amino)imidazo[1,2-a]pyrazin-3-yl)phenol chemical structure, C21H19FN4O3S, CAS 1436383-95-7](/s/IMHZCCZYPHJVMS-UHFFFAOYSA-N.svg)
2-Fluoro-4-(2-methyl-8-((3-(methylsulfonyl)benzyl)amino)imidazo[1,2-a]pyrazin-3-yl)phenol
CAS 1436383-95-7C21H19FN4O3S
![N-(2-(2-(2-Fluorophenyl)thiazolo[3,2-b][1,2,4]triazol-6-yl)ethyl)-3,5-dimethoxybenzamide chemical structure, C21H19FN4O3S, CAS 895788-80-4](/s/QHMBCIUXMQDLCY-UHFFFAOYSA-N.svg)
N-(2-(2-(2-Fluorophenyl)thiazolo[3,2-b][1,2,4]triazol-6-yl)ethyl)-3,5-dimethoxybenzamide
CAS 895788-80-4C21H19FN4O3S
![4-Fluoro-N-(5-(6-methoxyimidazo[1,2-b]pyridazin-2-yl)-2-methylphenyl)-3-methylbenzenesulfonamide chemical structure, C21H19FN4O3S, CAS 946382-46-3](/s/MPMBBVYMPDKYAM-UHFFFAOYSA-N.svg)
4-Fluoro-N-(5-(6-methoxyimidazo[1,2-b]pyridazin-2-yl)-2-methylphenyl)-3-methylbenzenesulfonamide
CAS 946382-46-3C21H19FN4O3S
3-Fluoro-N-(6-((2-((3-methoxybenzyl)amino)-2-oxoethyl)thio)pyridazin-3-yl)benzamide
CAS 1021090-61-8C21H19FN4O3S
![Methyl 5-(((1-(4-fluorophenyl)-4-isopropyl-1H-pyrazolo[3,4-d]pyridazin-7-yl)thio)methyl)furan-2-carboxylate chemical structure, C21H19FN4O3S, CAS 1105203-03-9](/s/XKACMELHUBQYTD-UHFFFAOYSA-N.svg)
Methyl 5-(((1-(4-fluorophenyl)-4-isopropyl-1H-pyrazolo[3,4-d]pyridazin-7-yl)thio)methyl)furan-2-carboxylate
CAS 1105203-03-9C21H19FN4O3S
3-Fluoro-N-(6-((2-((2-methoxybenzyl)amino)-2-oxoethyl)thio)pyridazin-3-yl)benzamide
CAS 1021056-04-1C21H19FN4O3S
4-(2-(2-((4-Fluorobenzyl)thio)-4-methyl-6-oxo-1,6-dihydropyrimidin-5-yl)acetamido)benzamide
CAS 1105214-65-0C21H19FN4O3S
N-Benzyl-2-(2-((2-((2-fluorophenyl)amino)-2-oxoethyl)thio)-6-oxo-1,6-dihydropyrimidin-4-yl)acetamide
CAS 1105239-15-3C21H19FN4O3S
N-(3-Acetamidophenyl)-2-(2-((2-fluorobenzyl)thio)-6-oxo-1,6-dihydropyrimidin-4-yl)acetamide
CAS 1105241-04-0C21H19FN4O3S
![(E)-N-[4-[(2,6-Dimethylpyrimidin-4-yl)sulfamoyl]phenyl]-3-(4-fluorophenyl)prop-2-enamide chemical structure, C21H19FN4O3S, CAS 543722-08-3](/s/FVEDZYTUNMQQER-LFYBBSHMSA-N.svg)
(E)-N-[4-[(2,6-Dimethylpyrimidin-4-yl)sulfamoyl]phenyl]-3-(4-fluorophenyl)prop-2-enamide
CAS 543722-08-3C21H19FN4O3S
![1-{[3-(4-Fluorophenyl)-2-mercapto-4-oxo-3,4-dihydroquinazolin-7-yl]carbonyl}piperidine-4-carboxamide chemical structure, C21H19FN4O3S, CAS 421591-75-5](/s/FEAUVGXCYYZRLL-UHFFFAOYSA-N.svg)
1-{[3-(4-Fluorophenyl)-2-mercapto-4-oxo-3,4-dihydroquinazolin-7-yl]carbonyl}piperidine-4-carboxamide
CAS 421591-75-5C21H19FN4O3S
![3-((4-Fluorophenyl)sulfonyl)-2-imino-8-methyl-1-propyl-1H-dipyrido[1,2-a:2',3'-d]pyrimidin-5(2H)-one chemical structure, C21H19FN4O3S, CAS 845652-16-6](/s/PCJPOHPGGOENQG-UHFFFAOYSA-N.svg)
3-((4-Fluorophenyl)sulfonyl)-2-imino-8-methyl-1-propyl-1H-dipyrido[1,2-a:2',3'-d]pyrimidin-5(2H)-one
CAS 845652-16-6C21H19FN4O3S
![3-[(4-Fluorophenyl)sulfonyl]-1-(tetrahydrofuran-2-ylmethyl)-1H-pyrrolo[2,3-b]quinoxalin-2-amine chemical structure, C21H19FN4O3S, CAS 749896-71-7](/s/RWCFCKRSZJGBFW-UHFFFAOYSA-N.svg)
3-[(4-Fluorophenyl)sulfonyl]-1-(tetrahydrofuran-2-ylmethyl)-1H-pyrrolo[2,3-b]quinoxalin-2-amine
CAS 749896-71-7C21H19FN4O3S
5-((4-Fluorobenzyl)amino)-2-(4-(pyrrolidin-1-ylsulfonyl)phenyl)oxazole-4-carbonitrile
CAS 940998-25-4C21H19FN4O3S
![1-(4-Fluorophenyl)-N-[(2E)-5-(4-methoxybenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-5-oxopyrrolidine-3-carboxamide chemical structure, C21H19FN4O3S, CAS 881791-15-7](/s/BBZXQKKJRBFNAJ-UHFFFAOYSA-N.svg)
1-(4-Fluorophenyl)-N-[(2E)-5-(4-methoxybenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-5-oxopyrrolidine-3-carboxamide
CAS 881791-15-7C21H19FN4O3S
![1-(2-Fluorophenyl)-N-[(2E)-5-(4-methoxybenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-5-oxopyrrolidine-3-carboxamide chemical structure, C21H19FN4O3S, CAS 1144441-86-0](/s/OCIITSOLFNGNOQ-UHFFFAOYSA-N.svg)
1-(2-Fluorophenyl)-N-[(2E)-5-(4-methoxybenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-5-oxopyrrolidine-3-carboxamide
CAS 1144441-86-0C21H19FN4O3S
![N-[(2E)-5-(4-Fluorobenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-1-(2-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide chemical structure, C21H19FN4O3S, CAS 1190252-02-8](/s/ZWTHAZCAMPMQEC-UHFFFAOYSA-N.svg)
N-[(2E)-5-(4-Fluorobenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-1-(2-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide
CAS 1190252-02-8C21H19FN4O3S
![N-[(2E)-5-(4-Fluorobenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-1-(4-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide chemical structure, C21H19FN4O3S, CAS 1190285-30-3](/s/SHRBGNZTBMFCPP-UHFFFAOYSA-N.svg)
N-[(2E)-5-(4-Fluorobenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-1-(4-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide
CAS 1190285-30-3C21H19FN4O3S
![N-[(2E)-5-(4-Fluorobenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-1-(3-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide chemical structure, C21H19FN4O3S, CAS 1190251-43-4](/s/PGLQZMJIZPJLRS-UHFFFAOYSA-N.svg)
N-[(2E)-5-(4-Fluorobenzyl)-1,3,4-thiadiazol-2(3H)-ylidene]-1-(3-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide
CAS 1190251-43-4C21H19FN4O3S
- N-(4-Fluorophenyl)-N-[(4-methoxyphenyl)methyl]-3-methyl-[1,2,4]triazolo[4,3-a]pyridine-8-sulfonamide1251570-87-2C21H19FN4O3S
- N-[(2-Fluorophenyl)methyl]-N-(4-methoxyphenyl)-3-methyl-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251592-93-4C21H19FN4O3S
- 2-(1,1-Dioxido-4-(p-tolyl)-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(3-fluorophenyl)acetamide1251680-06-4C21H19FN4O3S
- 2-(4-(3-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(p-tolyl)acetamide1251632-70-8C21H19FN4O3S
- 2-(4-(3-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-methyl-N-phenylacetamide1251707-82-0C21H19FN4O3S
- 2-((1-(4-Fluorophenyl)-5-(3-nitrophenyl)-1H-imidazol-2-yl)thio)-1-(pyrrolidin-1-yl)ethanone1234979-91-9C21H19FN4O3S
- N-(3-Fluorophenyl)-2-({8-methoxy-3,5-dimethyl-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl}sulfanyl)acetamide1113102-32-1C21H19FN4O3S
- 1-(4-Fluorobenzyl)-5-oxo-N-[(2E)-5-(phenoxymethyl)-1,3,4-thiadiazol-2(3H)-ylidene]pyrrolidine-3-carboxamide1246053-25-7C21H19FN4O3S
- N1-(3-acetamidophenyl)-N2-(2-(2-(3-fluorophenyl)thiazol-4-yl)ethyl)oxalamide895784-80-2C21H19FN4O3S
- N-(3-(1H-Imidazol-1-yl)propyl)-2-(2-fluorophenyl)-4-(phenylsulfonyl)oxazol-5-amine862797-92-0C21H19FN4O3S
- N1-(4-carbamoylphenyl)-N2-(2-(2-(4-fluorophenyl)-4-methylthiazol-5-yl)ethyl)oxalamide946375-07-1C21H19FN4O3S
- N'-(4-Carbamoylphenyl)-N-{2-[2-(3-fluorophenyl)-4-methyl-1,3-thiazol-5-yl]ethyl}ethanediamide946228-48-4C21H19FN4O3S
- N-(4-(3-((3-Acetamidophenyl)amino)-3-oxopropyl)thiazol-2-yl)-4-fluorobenzamide1021255-92-4C21H19FN4O3S
- N-[(3-Fluorophenyl)methyl]-N-(4-methoxyphenyl)-3-methyl-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251628-20-2C21H19FN4O3S
- N-(4-Ethoxyphenyl)-N-[(3-fluorophenyl)methyl]-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251593-01-7C21H19FN4O3S
- N-(4-Ethoxyphenyl)-N-[(4-fluorophenyl)methyl]-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251604-94-0C21H19FN4O3S
- N-(3-Fluorophenyl)-N-[(3-methoxyphenyl)methyl]-3-methyl-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251678-55-3C21H19FN4O3S
- N-(4-Fluorophenyl)-N-[(3-methoxyphenyl)methyl]-3-methyl-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251661-45-6C21H19FN4O3S
- N-(3-Fluoro-4-methylphenyl)-N-[(3-methoxyphenyl)methyl]-[1,2,4]triazolo[4,3-a]pyridine-6-sulfonamide1251605-38-5C21H19FN4O3S
- 2-(1,1-Dioxido-4-(p-tolyl)-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(4-fluorophenyl)acetamide1251596-27-6C21H19FN4O3S
- 2-(1,1-Dioxido-4-(p-tolyl)-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(2-fluorophenyl)acetamide1251670-34-4C21H19FN4O3S
- 2-(4-(3-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(o-tolyl)acetamide1251624-08-4C21H19FN4O3S
- 2-(4-(3-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(m-tolyl)acetamide1251545-97-7C21H19FN4O3S
- 2-(4-(4-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(p-tolyl)acetamide1251680-27-9C21H19FN4O3S
- 2-(4-(4-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(o-tolyl)acetamide1251611-68-3C21H19FN4O3S
- 2-(4-(4-Fluorophenyl)-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-2-yl)-N-(m-tolyl)acetamide1251597-20-2C21H19FN4O3S
- 1-(4-Fluorophenyl)-N-[3-(methylcarbamoyl)-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]-4-oxo-1,4-dihydropyridazine-3-carboxamide898610-59-8C21H19FN4O3S
- N-(3-(1H-Imidazol-1-yl)propyl)-4-((4-fluorophenyl)sulfonyl)-2-phenyloxazol-5-amine862761-65-7C21H19FN4O3S
- N-((5-((2-(3,4-Dihydroquinolin-1(2H)-yl)-2-oxoethyl)thio)-1,3,4-oxadiazol-2-yl)methyl)-4-fluorobenzamide903268-80-4C21H19FN4O3S
- N-(2-(2-(4-Fluorophenyl)thiazolo[3,2-b][1,2,4]triazol-6-yl)ethyl)-3,4-dimethoxybenzamide894046-10-7C21H19FN4O3S
- N-(2-(2-(4-Fluorophenyl)thiazolo[3,2-b][1,2,4]triazol-6-yl)ethyl)-3,5-dimethoxybenzamide894047-88-2C21H19FN4O3S
- N-(2-(2-(4-Fluorophenyl)thiazolo[3,2-b][1,2,4]triazol-6-yl)ethyl)-2,3-dimethoxybenzamide894048-20-5C21H19FN4O3S
- N-(2-(2-(3,4-Dimethoxyphenyl)thiazolo[3,2-b][1,2,4]triazol-6-yl)ethyl)-2-fluorobenzamide894049-64-0C21H19FN4O3S
- 2-((2-(Benzylamino)-2-oxoethyl)thio)-N-(4-fluorophenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-5-carboxamide894029-88-0C21H19FN4O3S
- N-(4-Fluorophenyl)-2-({8-methoxy-3,5-dimethyl-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl}sulfanyl)acetamide1112374-97-6C21H19FN4O3S
- 2-(((3-(4-Fluorophenyl)-1,2,4-oxadiazol-5-yl)methyl)thio)-3-(3-methoxypropyl)quinazolin-4(3H)-one2034399-89-6C21H19FN4O3S
- 6-Fluoro-2-({[3-(2-methoxyphenyl)-1,2,4-oxadiazol-5-yl]methyl}sulfanyl)-3-propyl-3,4-dihydroquinazolin-4-one2320726-24-5C21H19FN4O3S
- 2-[[4-Ethyl-5-(7-methoxy-1-benzofuran-2-yl)-1,2,4-triazol-3-yl]sulfanyl]-N-(3-fluorophenyl)acetamide767325-89-3C21H19FN4O3S
- (E)-Ethyl 5-(4-fluorophenyl)-7-methyl-2-((1-methyl-1H-pyrazol-4-yl)methylene)-3-oxo-3,5-dihydro-2H-thiazolo[3,2-a]pyrimidine-6-carboxylate492427-55-1C21H19FN4O3S
- Benzamide, 3-[(dimethylamino)sulfonyl]-4-fluoro-N-[4-(2-phenyldiazenyl)phenyl]-1390949-57-1C21H19FN4O3S
- 3-(5-(1-(2-((4-Fluorophenyl)thio)acetyl)azetidin-3-yl)-1,2,4-oxadiazol-3-yl)-N-methylbenzamide1396802-28-0C21H19FN4O3S
- Methyl 3-amino-2-(2-{[4-(4-fluorophenyl)-5-phenyl-4H-1,2,4-triazol-3-yl]sulfanyl}acetyl)but-2-enoate871225-80-8C21H19FN4O3S
- Acetamide, 2-[[(4-fluorophenyl)sulfonyl]methylamino]-N-[4-(2-phenyldiazenyl)phenyl]-1390922-70-9C21H19FN4O3S
- 4-({4-[(7-Fluoro-4-oxo-3,4-dihydroquinazolin-3-yl)methyl]piperidin-1-yl}sulfonyl)benzonitrile2415553-80-7C21H19FN4O3S
- 2-({4-[(7-Fluoro-4-oxo-3,4-dihydroquinazolin-3-yl)methyl]piperidin-1-yl}sulfonyl)benzonitrile2415509-62-3C21H19FN4O3S
- 1-[5-(2-Fluorophenyl)-1-methyl-2-oxo-2,3-dihydro-1H-1,4-benzodiazepin-3-yl]-3-(2-oxothiolan-3-yl)urea2624114-43-6C21H19FN4O3S
- 1-[5-(2-Fluorophenyl)-1-methyl-2-oxo-2,3-dihydro-1H-1,4-benzodiazepin-3-yl]-3-(5-oxothiolan-3-yl)urea2624114-46-9C21H19FN4O3S
- Methyl 2-ethanimidoyl-4-[[4-(4-fluorophenyl)-5-phenyl-1,2,4-triazol-3-yl]sulfanyl]-3-hydroxybut-2-enoateC21H19FN4O3S
Frequently asked questions
What is the molar mass of C21H19FN4O3S?
The molar mass of C21H19FN4O3S is 426.47 g/mol, calculated from standard atomic weights for 21 carbon atoms, 19 hydrogen atoms, 1 fluorine atom, 4 nitrogen atoms, 3 oxygen atoms and 1 sulfur atom. The monoisotopic mass is 426.1162 Da.
How many compounds have the formula C21H19FN4O3S?
CompoundList lists 72 compounds with the molecular formula C21H19FN4O3S, including 1-(2-Fluorophenyl)-5-[[4-(4-morpholinyl)anilino]methylidene]-2-sulfanylidene-1,3-diazinane-4,6-dione, 3-((4-Fluorophenyl)sulfonyl)-2-imino-10-methyl-1-propyl-1H-dipyrido[1,2-a:2',3'-d]pyrimidin-5(2H)-one, N-(4-Fluorophenyl)-2-{[3-(2-methoxyethyl)-4-oxo-3H,4H,5H-pyrimido[5,4-b]indol-2-yl]sulfanyl}acetamide. 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 C21H19FN4O3S?
C21H19FN4O3S has a degree of unsaturation of 14. 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.