Molecular formula
C19H23N3O4
212 compounds have this formula on CompoundList.
- Molar mass
- 357.41g/mol
- Monoisotopic mass
- 357.1689Da
- Atoms
- 49
- Elements
- 4
- Rings plus double bonds
- 10
The formula C19H23N3O4 describes a molecule made of 19 carbon atoms, 23 hydrogen atoms, 3 nitrogen atoms and 4 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 × 1963.85%12.011 × 19 = 228.209 g/mol
- H Hydrogen × 236.49%1.008 × 23 = 23.184 g/mol
- N Nitrogen × 311.76%14.007 × 3 = 42.021 g/mol
- O Oxygen × 417.91%15.999 × 4 = 63.996 g/mol
Look up another formula
Compounds with the formula C19H23N3O4
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 101 to 200 of 212 compounds
![3-Benzyl-8-(tetrahydrofuran-2-carbonyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione chemical structure, C19H23N3O4, CAS 1021066-97-6](/s/UZQFQFKARRNTEI-UHFFFAOYSA-N.svg)
3-Benzyl-8-(tetrahydrofuran-2-carbonyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione
CAS 1021066-97-6C19H23N3O4
(4-(5-Cyclopropyl-1,3,4-oxadiazol-2-yl)piperidin-1-yl)(2,4-dimethoxyphenyl)methanone
CAS 1172710-29-0C19H23N3O4
![1-(3-(5-(Benzo[d][1,3]dioxol-5-yl)-1,3,4-oxadiazol-2-yl)piperidin-1-yl)-3-methylbutan-1-one chemical structure, C19H23N3O4, CAS 1173260-96-2](/s/NZTOJKZLKZSEPB-UHFFFAOYSA-N.svg)
1-(3-(5-(Benzo[d][1,3]dioxol-5-yl)-1,3,4-oxadiazol-2-yl)piperidin-1-yl)-3-methylbutan-1-one
CAS 1173260-96-2C19H23N3O4
(4-(5-Cyclopropyl-1,3,4-oxadiazol-2-yl)piperidin-1-yl)(2,3-dimethoxyphenyl)methanone
CAS 1211729-41-7C19H23N3O4
![[1-({[(1-Oxophthalazin-2(1H)-yl)acetyl]amino}methyl)cyclohexyl]acetic acid chemical structure, C19H23N3O4, CAS 1246044-63-2](/s/NLATZIRWERNMNM-UHFFFAOYSA-N.svg)
[1-({[(1-Oxophthalazin-2(1H)-yl)acetyl]amino}methyl)cyclohexyl]acetic acid
CAS 1246044-63-2C19H23N3O4
N-(3,4-Dimethoxybenzyl)-2-(3-oxo-5,6,7,8-tetrahydrocinnolin-2(3H)-yl)acetamide
CAS 1282141-58-5C19H23N3O4
![N-(2,4-Dimethoxyphenyl)-2-(3-oxo-3,5,6,7,8,9-hexahydro-2H-cyclohepta[c]pyridazin-2-yl)acetamide chemical structure, C19H23N3O4, CAS 1282116-52-2](/s/LTORYMONMJUWCD-UHFFFAOYSA-N.svg)
N-(2,4-Dimethoxyphenyl)-2-(3-oxo-3,5,6,7,8,9-hexahydro-2H-cyclohepta[c]pyridazin-2-yl)acetamide
CAS 1282116-52-2C19H23N3O4
![Methyl {1-[(3-methyl-4-oxo-3,4-dihydrophthalazin-1-yl)acetyl]piperidin-4-yl}acetate chemical structure, C19H23N3O4, CAS 1324082-54-3](/s/MXNLBMLPLNGKOL-UHFFFAOYSA-N.svg)
Methyl {1-[(3-methyl-4-oxo-3,4-dihydrophthalazin-1-yl)acetyl]piperidin-4-yl}acetate
CAS 1324082-54-3C19H23N3O4
![1-(2,4-Dimethoxyphenyl)-5-oxo-N-[2-(1H-pyrrol-1-yl)ethyl]pyrrolidine-3-carboxamide chemical structure, C19H23N3O4, CAS 1324079-09-5](/s/CURHBJMDKWQRQF-UHFFFAOYSA-N.svg)
1-(2,4-Dimethoxyphenyl)-5-oxo-N-[2-(1H-pyrrol-1-yl)ethyl]pyrrolidine-3-carboxamide
CAS 1324079-09-5C19H23N3O4
3-(1-Methyl-cyclopropyl)-5-phenoxycarbonylamino-pyrazole-1-carboxylic acid tert-butyl ester
CAS 1229454-47-0C19H23N3O4
4-Benzyl-N-(3-(tert-butyl)isoxazol-5-yl)-5-oxomorpholine-3-carboxamide
CAS 1351587-74-0C19H23N3O4
![(1-(Benzo[d]oxazol-2-yl)pyrrolidin-2-yl)(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)methanone chemical structure, C19H23N3O4, CAS 1796886-04-8](/s/FDYOQRSNWUCFGT-UHFFFAOYSA-N.svg)
(1-(Benzo[d]oxazol-2-yl)pyrrolidin-2-yl)(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)methanone
CAS 1796886-04-8C19H23N3O4
![2-[(2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl)oxy]-N-[1-(oxolan-3-yl)-1H-pyrazol-4-yl]acetamide chemical structure, C19H23N3O4, CAS 1797020-46-2](/s/BKCWTAMAHADKSP-UHFFFAOYSA-N.svg)
2-[(2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl)oxy]-N-[1-(oxolan-3-yl)-1H-pyrazol-4-yl]acetamide
CAS 1797020-46-2C19H23N3O4
N1-(2-(2,3-dihydrobenzofuran-5-yl)-2-(dimethylamino)ethyl)-N2-(furan-2-ylmethyl)oxalamide
CAS 1705800-33-4C19H23N3O4
Ethyl 4-oxo-4-(4-(quinoxalin-2-yloxy)piperidin-1-yl)butanoate
CAS 1705903-61-2C19H23N3O4
![3,4-Dimethoxy-N-[(1r,4r)-4-(pyrazin-2-yloxy)cyclohexyl]benzamide chemical structure, C19H23N3O4, CAS 2034395-76-9](/s/RIOUUPNZXJRLOH-UHFFFAOYSA-N.svg)
3,4-Dimethoxy-N-[(1r,4r)-4-(pyrazin-2-yloxy)cyclohexyl]benzamide
CAS 2034395-76-9C19H23N3O4
![3,5-Dimethoxy-N-[(1r,4r)-4-(pyrimidin-2-yloxy)cyclohexyl]benzamide chemical structure, C19H23N3O4, CAS 2034444-37-4](/s/UGNHEDKLFADTSG-UHFFFAOYSA-N.svg)
3,5-Dimethoxy-N-[(1r,4r)-4-(pyrimidin-2-yloxy)cyclohexyl]benzamide
CAS 2034444-37-4C19H23N3O4
![2-(2-Methoxyphenoxy)-N-[(1r,4r)-4-(pyrimidin-2-yloxy)cyclohexyl]acetamide chemical structure, C19H23N3O4, CAS 2034444-42-1](/s/WWHLYBGDHKREQL-UHFFFAOYSA-N.svg)
2-(2-Methoxyphenoxy)-N-[(1r,4r)-4-(pyrimidin-2-yloxy)cyclohexyl]acetamide
CAS 2034444-42-1C19H23N3O4
![2-(3-Methoxyphenoxy)-N-[(1r,4r)-4-(pyrimidin-2-yloxy)cyclohexyl]acetamide chemical structure, C19H23N3O4, CAS 2034247-75-9](/s/SCIOPMGZPUCNBQ-UHFFFAOYSA-N.svg)
2-(3-Methoxyphenoxy)-N-[(1r,4r)-4-(pyrimidin-2-yloxy)cyclohexyl]acetamide
CAS 2034247-75-9C19H23N3O4
![3-(4-Methoxyphenyl)-1-{3-[(3-methoxypyrazin-2-yl)oxy]pyrrolidin-1-yl}propan-1-one chemical structure, C19H23N3O4, CAS 2034208-02-9](/s/LEUICRFMWVEXNY-UHFFFAOYSA-N.svg)
3-(4-Methoxyphenyl)-1-{3-[(3-methoxypyrazin-2-yl)oxy]pyrrolidin-1-yl}propan-1-one
CAS 2034208-02-9C19H23N3O4
2-(3-Methoxyphenyl)-1-(3-((3-methoxypyrazin-2-yl)oxy)piperidin-1-yl)ethanone
CAS 2034437-05-1C19H23N3O4
4-Methoxy-5-(4-(4-methoxyphenyl)piperazine-1-carbonyl)-1-methylpyridin-2(1H)-one
CAS 2034551-76-1C19H23N3O4
1-(2,3-Dimethoxyphenyl)-3-(4-(3-methoxyazetidin-1-yl)phenyl)urea
CAS 2034524-34-8C19H23N3O4
2-(4-Acetamidophenyl)-N-(2-(4-methoxy-6-methyl-2-oxopyridin-1(2H)-yl)ethyl)acetamide
CAS 2034455-74-6C19H23N3O4
- 3-Phenyl-1-(1-(tetrahydrofuran-3-carbonyl)piperidin-4-yl)imidazolidine-2,4-dione2034604-48-1C19H23N3O4
- 2-(Cyclopropylmethoxy)-N-((2-(2-methoxyethoxy)pyridin-3-yl)methyl)isonicotinamide2034431-95-1C19H23N3O4
- N-(2,3-Dimethoxyphenyl)-3-[(5-methylpyridin-2-yl)oxy]pyrrolidine-1-carboxamide1904268-70-7C19H23N3O4
- N-(Octahydrobenzo[b][1,4]dioxin-6-yl)-3-(4-oxoquinazolin-3(4H)-yl)propanamide1902956-98-2C19H23N3O4
- N-((6-Methoxypyridin-3-yl)methyl)-2-((tetrahydro-2H-pyran-4-yl)methoxy)isonicotinamide2034271-45-7C19H23N3O4
- 1-(3-((4,6-Dimethylpyrimidin-2-yl)oxy)pyrrolidin-1-yl)-2-(2-methoxyphenoxy)ethanone2034251-90-4C19H23N3O4
- 2-(2-Methoxyethoxy)-N-(4-morpholinophenyl)isonicotinamide2034316-99-7C19H23N3O4
- 4-((1-(6-Methoxynicotinoyl)piperidin-4-yl)oxy)-1,6-dimethylpyridin-2(1H)-one2034291-44-4C19H23N3O4
- 2-(3-Methoxyphenoxy)-1-(3-((2-methylpyrimidin-4-yl)oxy)piperidin-1-yl)ethanone2034400-76-3C19H23N3O4
- 7-[4-(3,3-Dimethyl-4-oxoazetidin-2-yl)piperidine-1-carbonyl]-3-methyl-1,3-benzoxazol-2-one2224319-57-5C19H23N3O4
- t-Butyl [2-(3-phenoxypyridine-2-carboxamido)ethyl]carbamate103877-90-3C19H23N3O4
- 1-[(1-Cyanocyclohexyl)carbamoyl]ethyl 4-acetamidobenzoate938687-74-2C19H23N3O4
- 6-(4-Ethoxyphenyl)-2-(1-morpholino-1-oxopropan-2-yl)pyridazin-3(2H)-one1203300-52-0C19H23N3O4
- tert-Butyl 4-(6-hydroxyquinoline-2-carbonyl)piperazine-1-carboxylate1802854-70-1C19H23N3O4
- 2-(2H-1,3-Benzodioxol-5-yloxy)-1-[2-(1-methyl-1H-pyrazol-4-yl)piperidin-1-yl]propan-1-one2097897-50-0C19H23N3O4
- N'-[(1-Hydroxycyclohex-2-en-1-yl)methyl]-N-[3-(2-oxopyrrolidin-1-yl)phenyl]ethanediamide2097863-21-1C19H23N3O4
- N-[(2-Oxo-1,3-oxazolidin-5-yl)methyl]-4-phenyl-1-prop-2-enoylpiperidine-4-carboxamide2361720-07-0C19H23N3O4
- N-[4-(Diethylamino)-2-methylphenyl]-2-(2-nitrophenoxy)acetamide708217-73-6C19H23N3O4
- 4-[Bis(morpholin-4-yl)methylidene]-2-(4-methylphenyl)-1,3-oxazol-5(4H)-one61767-53-1C19H23N3O4
- 3-(3,4-Dimethoxyphenyl)-6-ethyl-2-(methoxymethyl)-5-methylpyrazolo[1,5-a]pyrimidin-7(4H)-one948205-17-2C19H23N3O4
- tert-Butyl 4-(4-nitronaphthalen-1-yl)piperazine-1-carboxylate193902-83-9C19H23N3O4
- N-(1-Cyanocyclobutyl)-1-(3,4-dimethoxyphenyl)-N-methyl-5-oxopyrrolidine-3-carboxamide2224052-85-9C19H23N3O4
- (S)-Benzyl 2-((tert-butoxycarbonyl)amino)-3-(pyrimidin-2-yl)propanoate1303993-83-0C19H23N3O4
- Ethyl 4-[(E)-{4-[bis(2-hydroxyethyl)amino]phenyl}diazenyl]benzoate59405-18-4C19H23N3O4
- 2-(3,4-Dimethoxyphenyl)-1-(4-(pyridazin-3-yloxy)piperidin-1-yl)ethanone1797221-56-7C19H23N3O4
- N-[2-(2,6-Dioxo-3-piperidyl)-1-oxo-isoindolin-4-yl]-4-methyl-pentanamide2761409-67-8C19H23N3O4
- 7-[(Benzyloxy)carbonyl]-2-(2-methylpropyl)-5H,6H,7H,8H-imidazo[1,2-a]pyrazine-3-carboxylic acid2060025-66-1C19H23N3O4
- 7-[(Benzyloxy)carbonyl]-2-tert-butyl-5H,6H,7H,8H-imidazo[1,2-a]pyrazine-3-carboxylic acid2059966-91-3C19H23N3O4
- tert-Butyl (1-(2'-oxospiro[azetidine-3,3'-indoline]-1-carbonyl)cyclopropyl)carbamate2073126-54-0C19H23N3O4
- Benzyl 4-(3-cyclopropyl-2,4-dioxoimidazolidin-1-yl)piperidine-1-carboxylate2097892-28-7C19H23N3O4
- 1-[3-(2,3-Dihydro-1-benzofuran-5-yl)pyrrolidine-1-carbonyl]-4-ethylpiperazine-2,3-dione2097863-24-4C19H23N3O4
- 7-[(Benzyloxy)carbonyl]-2-(butan-2-yl)-5H,6H,7H,8H-imidazo[1,2-a]pyrazine-3-carboxylic acid2059966-34-4C19H23N3O4
- 2-Benzyl 7-(tert-butyl) 5,6-dihydroimidazo[1,2-a]pyrazine-2,7(8H)-dicarboxylate2306272-25-1C19H23N3O4
- 5-({[(Benzyloxy)carbonyl]amino}methyl)-1-(1-methyl-1H-pyrrol-3-yl)pyrrolidine-2-carboxylic acid2059933-72-9C19H23N3O4
- 2-{[1-(3,5-Dimethoxybenzoyl)piperidin-4-yl]oxy}-5-methylpyrimidine2380042-33-9C19H23N3O4
- 2-{[1-(2,3-Dimethoxybenzoyl)piperidin-4-yl]oxy}-5-methylpyrimidine2379998-10-2C19H23N3O4
- 2-{[1-(3,4-Dimethoxybenzoyl)piperidin-4-yl]oxy}-5-methylpyrimidine2380172-94-9C19H23N3O4
- tert-Butyl 3-[3-(2-methoxyphenyl)-6-oxo-1,6-dihydropyridazin-1-yl]azetidine-1-carboxylate2380190-06-5C19H23N3O4
- [4-(6-Amino-4-methoxy-3-pyridinyl)-1-piperidinyl](4-hydroxy-3-methoxyphenyl)methanone2374908-39-9C19H23N3O4
- N-[4-[4-(Oxolane-2-carbonyl)piperazine-1-carbonyl]phenyl]prop-2-enamide2361876-98-2C19H23N3O4
- N-[(1S)-1,2-Dimethylpropyl]-2-(2,6-dioxo-3-piperidyl)-1-oxo-isoindoline-5-carboxamide2564487-75-6C19H23N3O4
- 1-[(Benzyloxy)carbonyl]-4-(1,3,5-trimethyl-1H-pyrazol-4-yl)pyrrolidine-3-carboxylic acid2171968-74-2C19H23N3O4
- N-[2-(2,6-Dioxo-3-piperidyl)-3-oxo-isoindolin-5-yl]-4-methyl-pentanamide2761393-81-9C19H23N3O4
- 4-{[1-(2,5-Dimethylfuran-3-carbonyl)piperidin-4-yl]methoxy}pyridine-2-carboxamide2877632-79-4C19H23N3O4
- tert-Butyl 9-(1-hydroxyethyl)-4,7-dimethyl-5-oxo-4,5-dihydroimidazo[1,5-a]quinazoline-3-carboxylate3004741-54-9C19H23N3O4
- 2-(5-(2,4-Dioxotetrahydropyrimidin-1(2H)-yl)-2,3-dihydrospiro[indene-1,4'-piperidin]-1'-yl)acetic acid3026335-60-1C19H23N3O4
- (R)-Benzyl 2-((tert-butoxycarbonyl)amino)-3-(pyrimidin-2-yl)propanoate1303993-79-4C19H23N3O4
- (R)-Benzyl 2-((tert-butoxycarbonyl)amino)-3-(pyrimidin-5-yl)propanoate1303993-86-3C19H23N3O4
- (S)-Benzyl 2-((tert-butoxycarbonyl)amino)-3-(pyrimidin-5-yl)propanoate1303993-80-7C19H23N3O4
- Oxalic acid--1-[1-(1H-imidazol-1-yl)hexan-2-yl]-1H-indole (1/1)61022-29-5C19H23N3O4
- N-{1-[(3,5-Dimethyl-1,2-oxazol-4-yl)methyl]piperidin-4-YL}-2H-1,3-benzodioxole-5-carboxamide1775322-75-2C19H23N3O4
- (3S,5aR,10bR,11aS)-6-Acetyl-6,10b,11,11a-tetrahydro-10b-hydroxy-3-(2-methylpropyl)-2H-pyrazino[1a(2),2a(2):1,5]pyrrolo[2,3-b]indole-1,4(3H,5aH)-dione1613303-27-7C19H23N3O4
- 1'-(4-Methoxybenzyl)-5,6-dihydrospiro[imidazo[2,1-c][1,4]oxazine-8,4'-piperidine]-6-carboxylic acid1422060-20-5C19H23N3O4
- 4-(6-Aminohexyl)-2-(2,6-dioxo-3-piperidyl)isoindoline-1,3-dione2093386-64-0C19H23N3O4
- N-(3-tert-Butyl-1,2-oxazol-5-yl)-1-(4-methoxyphenyl)-5-oxopyrrolidine-3-carboxamide2327475-24-9C19H23N3O4
- 2-(2,6-Dioxopiperidin-3-yl)-N-(3-methylbutan-2-yl)-1-oxo-3H-isoindole-5-carboxamideC19H23N3O4
- tert-Butyl N-[4-[4-(2,4-dioxohexahydropyrimidin-1-yl)phenyl]but-3-ynyl]carbamate2633726-47-1C19H23N3O4
- tert-Butyl (R)-(5,11-dioxo-10,11-dihydro-1H,3H,5H-spiro[benzo[d]pyrazolo[1,2-a][1,2]diazepine-2,1'-cyclopropan]-10-yl)carbamate2195361-43-2C19H23N3O4
- 6-Methoxy-2-[2-(morpholine-4-carbonyl)morpholin-4-yl]quinoline2741894-32-4C19H23N3O4
- Benzyl N-[6-({[(tert-butoxy)carbonyl]amino}methyl)pyridin-3-yl]carbamate2756181-36-7C19H23N3O4
- 3-[(1-Benzyl-5-oxopyrrolidin-3-yl)methyl]-8-oxa-1,3-diazaspiro[4.5]decane-2,4-dione2770625-03-9C19H23N3O4
- 5-(6-Aminohexyl)-2-(2,6-dioxopiperidin-3-yl)isoindoline-1,3-dione2924611-99-2C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-3-(2-methyl-4,5,6,7-tetrahydro-1H-1,3-benzodiazol-1-yl)propanoic acid2137539-36-5C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-3-(4,5,6,7-tetrahydro-1H-1,3-benzodiazol-1-yl)butanoic acid2137489-46-2C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-3-(4-cyclobutyl-1H-pyrazol-1-yl)butanoic acid2137511-12-5C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-2-methyl-3-(4,5,6,7-tetrahydro-1H-1,3-benzodiazol-1-yl)propanoic acid2138541-03-2C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-2-cyclopropyl-3-(3,5-dimethyl-1H-pyrazol-1-yl)propanoic acid2138043-35-1C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-2-cyclopropyl-3-(2-ethyl-1H-imidazol-1-yl)propanoic acid2138560-20-8C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-2-cyclopropyl-3-(4-ethyl-1H-pyrazol-1-yl)propanoic acid2138070-02-5C19H23N3O4
- 2-{[(Benzyloxy)carbonyl]amino}-2-cyclopropyl-3-(4,5-dimethyl-1H-imidazol-1-yl)propanoic acid2138097-63-7C19H23N3O4
- 1-[(Benzyloxy)carbonyl]-4-[1-(propan-2-yl)-1H-pyrazol-5-yl]pyrrolidine-3-carboxylic acid2172135-23-6C19H23N3O4
- 1-[(Benzyloxy)carbonyl]-4-[1-(propan-2-yl)-1H-pyrazol-4-yl]pyrrolidine-3-carboxylic acid2172201-63-5C19H23N3O4
- 1-Benzyl-5-{[(tert-butoxy)carbonyl]amino}-2-cyclopropyl-1H-imidazole-4-carboxylic acid2580205-93-0C19H23N3O4
- 3-{4-[(Benzyloxy)carbonyl]-5,7-dimethyl-4H,5H,6H,7H-pyrazolo[1,5-a]pyrimidin-6-yl}propanoic acid2639455-14-2C19H23N3O4
- 4-[(Benzyloxy)carbonyl]-7-tert-butyl-4H,5H,6H,7H-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid2639460-91-4C19H23N3O4
- 5-[(tert-Butoxy)carbonyl]-1-(4-methylphenyl)-1H,4H,5H,6H,7H-pyrazolo[4,3-c]pyridine-3-carboxylic acid2639459-77-9C19H23N3O4
Frequently asked questions
What is the molar mass of C19H23N3O4?
The molar mass of C19H23N3O4 is 357.41 g/mol, calculated from standard atomic weights for 19 carbon atoms, 23 hydrogen atoms, 3 nitrogen atoms and 4 oxygen atoms. The monoisotopic mass is 357.1689 Da.
How many compounds have the formula C19H23N3O4?
CompoundList lists 212 compounds with the molecular formula C19H23N3O4, including 3-Benzyl-8-(tetrahydrofuran-2-carbonyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione, (4-(5-Cyclopropyl-1,3,4-oxadiazol-2-yl)piperidin-1-yl)(2,4-dimethoxyphenyl)methanone, 1-(3-(5-(Benzo[d][1,3]dioxol-5-yl)-1,3,4-oxadiazol-2-yl)piperidin-1-yl)-3-methylbutan-1-one. 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 C19H23N3O4?
C19H23N3O4 has a degree of unsaturation of 10. 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.