Molecular formula
C19H16N4O4
101 compounds have this formula on CompoundList.
- Molar mass
- 364.36g/mol
- Monoisotopic mass
- 364.1172Da
- Atoms
- 43
- Elements
- 4
- Rings plus double bonds
- 14
The formula C19H16N4O4 describes a molecule made of 19 carbon atoms, 16 hydrogen atoms, 4 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 × 1962.63%12.011 × 19 = 228.209 g/mol
- H Hydrogen × 164.43%1.008 × 16 = 16.128 g/mol
- N Nitrogen × 415.38%14.007 × 4 = 56.028 g/mol
- O Oxygen × 417.56%15.999 × 4 = 63.996 g/mol
Look up another formula
Compounds with the formula C19H16N4O4
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 101 compounds
Zidometacin
CAS 62851-43-8C19H16N4O4
![N'-[(E)-(1-Benzyl-2,4,6-trioxotetrahydropyrimidin-5(2H)-ylidene)methyl]benzohydrazide chemical structure, C19H16N4O4, CAS 4631-90-7](/s/METPNJPVPZGUHH-RGVLZGJSSA-N.svg)
N'-[(E)-(1-Benzyl-2,4,6-trioxotetrahydropyrimidin-5(2H)-ylidene)methyl]benzohydrazide
CAS 4631-90-7C19H16N4O4
![1-Methyl-7-((naphthalen-2-yloxy)methyl)-6,7-dihydrooxazolo[2,3-f]purine-2,4(1H,3H)-dione chemical structure, C19H16N4O4, CAS 382611-73-6](/s/NZWLZIXOVXEQGY-UHFFFAOYSA-N.svg)
1-Methyl-7-((naphthalen-2-yloxy)methyl)-6,7-dihydrooxazolo[2,3-f]purine-2,4(1H,3H)-dione
CAS 382611-73-6C19H16N4O4
Methyl 1-(2-furylmethyl)-2-imino-8-methyl-5-oxo-1,5-dihydro-2H-dipyrido(1,2-A:2,3-D)pyrimidine-3-carboxylate
CAS 510760-63-1C19H16N4O4
![Methyl 7-[(furan-2-yl)methyl]-6-imino-11-methyl-2-oxo-1,7,9-triazatricyclo[8.4.0.0^{3,8}]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate chemical structure, C19H16N4O4, CAS 510760-62-0](/s/DDBMDXVXDKTKRM-UHFFFAOYSA-N.svg)
Methyl 7-[(furan-2-yl)methyl]-6-imino-11-methyl-2-oxo-1,7,9-triazatricyclo[8.4.0.0^{3,8}]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate
CAS 510760-62-0C19H16N4O4
![3-[3-(Benzyloxy)pyridin-2-yl]-1-(4-nitrophenyl)urea chemical structure, C19H16N4O4, CAS 877458-91-8](/s/LVGIASYHZSVGII-UHFFFAOYSA-N.svg)
3-[3-(Benzyloxy)pyridin-2-yl]-1-(4-nitrophenyl)urea
CAS 877458-91-8C19H16N4O4
![N-(2,3-Dihydro-1,4-benzodioxin-6-yl)-2-oxo-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-4-carboxamide chemical structure, C19H16N4O4, CAS 1008965-91-0](/s/MEGOGTOLMYHVST-UHFFFAOYSA-N.svg)
N-(2,3-Dihydro-1,4-benzodioxin-6-yl)-2-oxo-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-4-carboxamide
CAS 1008965-91-0C19H16N4O4
1-(3-Benzyloxy-2-pyridyl)-3-(3-nitrophenyl)urea
CAS 877458-92-9C19H16N4O4
Chdi-180R
CAS 1883792-80-0C19H16N4O4
N-(1-(Furan-2-carbonyl)indolin-6-yl)-1-methyl-6-oxo-1,6-dihydropyridazine-3-carboxamide
CAS 1286698-23-4C19H16N4O4
4-(3-(Furan-2-yl)-5-(quinoxalin-6-yl)-4,5-dihydro-1H-pyrazol-1-yl)-4-oxobutanoic acid
CAS 946310-01-6C19H16N4O4
4-(1H-Benzimidazol-2-yl)-3-(2,4-dihydroxyphenyl)-1H-pyrazole-5-propanoic Acid
CAS 1217314-90-3C19H16N4O4
N-(6-Methylpyridin-2-yl)-1-(3-nitrobenzyl)-2-oxo-1,2-dihydropyridine-3-carboxamide
CAS 946379-25-5C19H16N4O4
![N-[3-(6-Ethoxypyridazin-3-yl)phenyl]-4-nitrobenzamide chemical structure, C19H16N4O4, CAS 899954-55-3](/s/DFADEIQURJDOQA-UHFFFAOYSA-N.svg)
N-[3-(6-Ethoxypyridazin-3-yl)phenyl]-4-nitrobenzamide
CAS 899954-55-3C19H16N4O4
![N-(2-Methoxy-5-(6-methoxyimidazo[1,2-b]pyridazin-2-yl)phenyl)furan-2-carboxamide chemical structure, C19H16N4O4, CAS 953149-73-0](/s/ITILZNVJQHZFRZ-UHFFFAOYSA-N.svg)
N-(2-Methoxy-5-(6-methoxyimidazo[1,2-b]pyridazin-2-yl)phenyl)furan-2-carboxamide
CAS 953149-73-0C19H16N4O4
3-Methyl-N-(4-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)phenyl)-4-nitrobenzamide
CAS 899977-92-5C19H16N4O4
![N-(2-(6-Oxo-3-(pyridin-4-yl)pyridazin-1(6H)-yl)ethyl)benzo[d][1,3]dioxole-5-carboxamide chemical structure, C19H16N4O4, CAS 1021108-49-5](/s/CGVJKENZGKGIKU-UHFFFAOYSA-N.svg)
N-(2-(6-Oxo-3-(pyridin-4-yl)pyridazin-1(6H)-yl)ethyl)benzo[d][1,3]dioxole-5-carboxamide
CAS 1021108-49-5C19H16N4O4
![Methyl 5-({4-methyl-7-oxo-1-phenyl-1H,6H,7H-pyrazolo[3,4-d]pyridazin-6-yl}methyl)furan-2-carboxylate chemical structure, C19H16N4O4, CAS 946203-82-3](/s/ZIKRPSMRPWTCHZ-UHFFFAOYSA-N.svg)
Methyl 5-({4-methyl-7-oxo-1-phenyl-1H,6H,7H-pyrazolo[3,4-d]pyridazin-6-yl}methyl)furan-2-carboxylate
CAS 946203-82-3C19H16N4O4
N-(6-Methylpyridin-2-yl)-1-(3-nitrobenzyl)-6-oxo-1,6-dihydropyridine-3-carboxamide
CAS 899970-58-2C19H16N4O4
![N-[3-(6-Methoxypyridazin-3-yl)phenyl]-4-methyl-3-nitrobenzamide chemical structure, C19H16N4O4, CAS 899954-18-8](/s/JEOZPWGIUREEKI-UHFFFAOYSA-N.svg)
N-[3-(6-Methoxypyridazin-3-yl)phenyl]-4-methyl-3-nitrobenzamide
CAS 899954-18-8C19H16N4O4
![N-(4-Carbamoylphenyl)-1,5-dioxo-2,3,4,5-tetrahydropyrrolo[1,2-a]quinazoline-3a(1H)-carboxamide chemical structure, C19H16N4O4, CAS 1236258-22-2](/s/DOTPNFXWUVROFA-UHFFFAOYSA-N.svg)
N-(4-Carbamoylphenyl)-1,5-dioxo-2,3,4,5-tetrahydropyrrolo[1,2-a]quinazoline-3a(1H)-carboxamide
CAS 1236258-22-2C19H16N4O4
![1-(Benzo[d][1,3]dioxole-5-carbonyl)-N-(1H-indazol-6-yl)azetidine-3-carboxamide chemical structure, C19H16N4O4, CAS 1396751-25-9](/s/ORFRJBZZTAGESG-UHFFFAOYSA-N.svg)
1-(Benzo[d][1,3]dioxole-5-carbonyl)-N-(1H-indazol-6-yl)azetidine-3-carboxamide
CAS 1396751-25-9C19H16N4O4
N-(1,3-Dihydro-2H-benzimidazol-2-ylidene)-2-(2-methoxyethyl)-1,3-dioxo-2,3-dihydro-1H-isoindole-5-carboxamide
CAS 1144440-86-7C19H16N4O4
![1,2,3,4-Tetrahydro-6-[(4-nitrophenyl)azo]benzo[H]quinoline-3,7-diol chemical structure, C19H16N4O4, CAS 94023-26-4](/s/WVJOJDCLAFKLPC-UHFFFAOYSA-N.svg)
1,2,3,4-Tetrahydro-6-[(4-nitrophenyl)azo]benzo[H]quinoline-3,7-diol
CAS 94023-26-4C19H16N4O4
- 3-Nitro-N-[5-(5,6,7,8-tetrahydronaphthalen-2-yl)-1,3,4-oxadiazol-2-yl]benzamide862809-17-4C19H16N4O4
- 3-(Benzo[d][1,3]dioxol-5-yl)-5-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrrol-2-yl)-1,2,4-oxadiazole1428366-83-9C19H16N4O4
- N-(2-((3-(Furan-2-yl)-1,2,4-oxadiazol-5-yl)methyl)phenyl)-3,5-dimethylisoxazole-4-carboxamide1706114-35-3C19H16N4O4
- [11C]CHDI-180R2805244-77-1C19H16N4O4
- 4-Nitro-N-[5-(5,6,7,8-tetrahydronaphthalen-2-yl)-1,3,4-oxadiazol-2-yl]benzamide862809-16-3C19H16N4O4
- 1-Methyl-4-(3-nitrophenyl)-6-phenyl-3,4,6,7-tetrahydro-1H-pyrrolo[3,4-d]pyrimidine-2,5-dione728035-93-6C19H16N4O4
- N-Benzyl-2-[3-(4-nitrophenyl)-6-oxopyridazin-1-yl]acetamide922907-21-9C19H16N4O4
- N-Benzyl-2-[3-(3-nitrophenyl)-6-oxopyridazin-1-yl]acetamide922907-93-5C19H16N4O4
- (E)-N-(5-(2,4-Dimethylphenyl)-1,3,4-oxadiazol-2-yl)-3-(3-nitrophenyl)acrylamide891145-29-2C19H16N4O4
- (E)-N-(5-(2,4-Dimethylphenyl)-1,3,4-oxadiazol-2-yl)-3-(4-nitrophenyl)acrylamide891111-58-3C19H16N4O4
- (E)-N-(5-(2,5-Dimethylphenyl)-1,3,4-oxadiazol-2-yl)-3-(3-nitrophenyl)acrylamide891118-77-7C19H16N4O4
- N-(1,3-Benzodioxol-5-yl)-2-[(2-methylquinolin-4-yl)carbonyl]hydrazinecarboxamide847473-01-2C19H16N4O4
- N-(4-Methylpyridin-2-yl)-1-(3-nitrobenzyl)-6-oxo-1,6-dihydropyridine-3-carboxamide899741-63-0C19H16N4O4
- 2-Methyl-N-(3-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)phenyl)-3-nitrobenzamide920199-91-3C19H16N4O4
- 3-Methyl-N-(3-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)phenyl)-4-nitrobenzamide899974-27-7C19H16N4O4
- 2-Methyl-N-[4-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)phenyl]-3-nitrobenzamide899974-32-4C19H16N4O4
- 2-(Benzo[d]isoxazol-3-yl)-N-(2-(3-(furan-2-yl)-6-oxopyridazin-1(6H)-yl)ethyl)acetamide1207026-78-5C19H16N4O4
- (2,3-Dihydrobenzo[b][1,4]dioxin-2-yl)(3-(3-(pyridin-2-yl)-1,2,4-oxadiazol-5-yl)azetidin-1-yl)methanone1251574-66-9C19H16N4O4
- N-(Benzo[d][1,3]dioxol-5-yl)-3-(3-phenyl-1,2,4-oxadiazol-5-yl)azetidine-1-carboxamide1251681-54-5C19H16N4O4
- 3-Ethyl-7-(3-(4-methoxyphenyl)-1,2,4-oxadiazol-5-yl)quinazoline-2,4(1H,3H)-dione1359064-76-8C19H16N4O4
- 2-(1,3-Benzodioxol-5-yl)-5-[(3,5-dimethyl-1,2-oxazol-4-yl)methyl]pyrazolo[1,5-a]pyrazin-4(5H)-one1326943-27-4C19H16N4O4
- N-(2,3-Dihydro-1,4-benzodioxin-6-yl)-2-(2-oxo-2,3-dihydro-1H-imidazo[1,2-a]benzimidazol-3-yl)acetamide1050329-64-0C19H16N4O4
- Bis[2-(4-nitrophenyl)ethyl]propanedinitrile5345-06-2C19H16N4O4
- 1-Methyl-6-(4-nitrophenyl)-4-phenyl-4,7-dihydro-3H-pyrrolo[3,4-d]pyrimidine-2,5-dione728016-23-7C19H16N4O4
- Methyl 5-((4-oxo-1-(p-tolyl)-1H-pyrazolo[3,4-d]pyrimidin-5(4H)-yl)methyl)furan-2-carboxylate912622-01-6C19H16N4O4
- Methyl 5-[[1-(2-methylphenyl)-4-oxopyrazolo[3,4-d]pyrimidin-5-yl]methyl]furan-2-carboxylate895012-61-0C19H16N4O4
- N-(4-Methylpyridin-2-yl)-1-(3-nitrobenzyl)-2-oxo-1,2-dihydropyridine-3-carboxamide923220-99-9C19H16N4O4
- 3-{2-[3-(4-Methoxyphenyl)-1,2,4-oxadiazol-5-yl]ethyl}-1,2,3,4-tetrahydroquinazoline-2,4-dione1031669-97-2C19H16N4O4
- 2-[(4-Methyl-2-oxo-2H-chromen-7-yl)oxy]-N-([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)acetamide1374513-63-9C19H16N4O4
- 2-(3-(Benzo[d][1,3]dioxol-5-yl)-6-oxopyridazin-1(6H)-yl)-N-(4-methylpyridin-2-yl)acetamide1251695-51-8C19H16N4O4
- 3-(2-Methoxyethyl)-7-(3-phenyl-1,2,4-oxadiazol-5-yl)quinazoline-2,4(1H,3H)-dione1359204-18-4C19H16N4O4
- 3-Cyclopropyl-5-{5-[(2-methoxyphenoxy)methyl]-1,3,4-oxadiazol-2-yl}[1,2]oxazolo[5,4-b]pyridine1375200-00-2C19H16N4O4
- 3-((1-(7-Methoxybenzofuran-2-carbonyl)pyrrolidin-3-yl)oxy)pyrazine-2-carbonitrile2034322-27-3C19H16N4O4
- 3-((1-(5-Methoxybenzofuran-2-carbonyl)pyrrolidin-3-yl)oxy)pyrazine-2-carbonitrile2034561-94-7C19H16N4O4
- N-((3-(1-Ethyl-1H-pyrrol-2-yl)-1,2,4-oxadiazol-5-yl)methyl)-4-oxo-4H-chromene-2-carboxamide2034453-90-0C19H16N4O4
- 2-(Benzo[d]isoxazol-3-yl)-1-(3-(5-(furan-2-yl)-1,2,4-oxadiazol-3-yl)pyrrolidin-1-yl)ethanone2034321-51-0C19H16N4O4
- N-[(Methoxyimino)methyl]-6-oxo-4-phenoxy-1-phenyl-1,6-dihydro-3-pyridazinecarboxamide338405-13-3C19H16N4O4
- N-[3-(6-Ethoxypyridazin-3-yl)phenyl]-2-nitrobenzamide899954-51-9C19H16N4O4
- N-[3-(6-Methoxypyridazin-3-yl)phenyl]-2-methyl-3-nitrobenzamide899746-58-8C19H16N4O4
- N-[3-(6-Methoxypyridazin-3-yl)phenyl]-3-methyl-4-nitrobenzamide899986-39-1C19H16N4O4
- N-[4-(6-Methoxypyridazin-3-yl)phenyl]-4-methyl-3-nitrobenzamide941946-11-8C19H16N4O4
- N-[4-(6-Methoxypyridazin-3-yl)phenyl]-3-methyl-4-nitrobenzamide941941-14-6C19H16N4O4
- N-[4-(Furan-2-yl)pyrimidin-2-yl]-3-(4-methoxyphenyl)-4,5-dihydro-1,2-oxazole-5-carboxamide1011350-49-4C19H16N4O4
- N-(4-Carbamoylphenyl)-4-methoxy-6-oxo-1-phenyl-1,6-dihydropyridazine-3-carboxamide921883-57-0C19H16N4O4
- (2Z)-3-(5-Acetyl-5,11-dihydro-2H,6H-[1,3]dioxolo[4,5-h]pyrrolo[2,1-c][1,4]benzodiazepin-9-yl)-2-cyanoprop-2-enamide53413-58-4C19H16N4O4
- Phenol, 3-[2-[2-(6-methyl-3-nitro-2-pyridinyl)-5-oxa-2,6-diazaspiro[3.4]oct-6-en-7-yl]ethynyl]-1354930-94-1C19H16N4O4
- Acetamide,N-[3-[[5-nitro-4-(phenylamino)-2-pyridinyl]oxy]phenyl]-850663-56-8C19H16N4O4
- N-(3-Ethynylphenyl)-7-(2-methoxyethoxy)-6-nitroquinazolin-4-amine1637255-37-8C19H16N4O4
- Glycine, N-1-naphthalenyl-, [(5-hydroxy-2-nitrophenyl)methylene]hydrazide349576-89-2C19H16N4O4
- N-(4-Methoxyphenyl)-2-oxo-2-(2-((2-oxo-1,2-dihydro-3-quinolinyl)methylene)hydrazino)acetamide881683-61-0C19H16N4O4
- N-(3-Methoxyphenyl)-2-oxo-2-(2-((2-oxo-1,2-dihydroquinolin-3-yl)methylene)hydrazinyl)acetamide881462-39-1C19H16N4O4
- 3-Benzyl-N-(4-carbamoylphenyl)-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxamide2742051-89-2C19H16N4O4
- 2-[3-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,4-triazol-1-yl]acetic acid2243513-36-0C19H16N4O4
- 4,4'-(Phenylmethylene)bis(2-nitroaniline)88948-19-0C19H16N4O4
- 4,4'-(Phenylmethylene)bis(3-nitroaniline)88948-20-3C19H16N4O4
- 2,2'-(Propane-1,3-diyl)bis(5-amino-1H-isoindole-1,3(2H)-dione)111953-88-9C19H16N4O4
- 4-(4-Nitrophenoxy)-N-[2-(4-pyridinyl)ethyl]-2-pyridinecarboxamide1280554-04-2C19H16N4O4
- 4-[({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1H-1,2,3-triazole-5-carboxylic acid2193061-11-7C19H16N4O4
- 2-[5-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-4H-1,2,4-triazol-3-yl]acetic acid2355066-60-1C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 6-methyl-1-(propan-2-yl)-1H-pyrazolo[3,4-b]pyridine-5-carboxylate2248328-70-1C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 5-(2,5-dimethyl-1H-pyrrol-1-yl)-1-methyl-1H-pyrazole-4-carboxylate2248286-00-0C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-(2-methylpropyl)-[1,2,4]triazolo[4,3-a]pyridine-8-carboxylate2248351-51-9C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 6-methyl-1-(propan-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylate2248277-88-3C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 2,5-dimethyl-1-(1-methyl-1H-pyrazol-4-yl)-1H-pyrrole-3-carboxylate2248275-72-9C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-{5,7-dimethylpyrazolo[1,5-a]pyrimidin-6-yl}propanoate2248307-47-1C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 1-(2-methylpropyl)-1H-pyrazolo[3,4-b]pyridine-5-carboxylate2248376-25-0C19H16N4O4
- 2-[5-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,4-triazol-1-yl]acetic acid2757951-12-3C19H16N4O4
- 2-[4-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,3-triazol-1-yl]acetic acid2137617-34-4C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-tert-butyl-[1,2,4]triazolo[4,3-a]pyridine-6-carboxylate2248382-48-9C19H16N4O4
- 2-[4-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-2H-1,2,3-triazol-2-yl]acetic acid2580231-49-6C19H16N4O4
- 5-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-1-methyl-1H-1,2,3-triazole-4-carboxylic acid2383589-61-3C19H16N4O4
- 5-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-1-methyl-1H-1,2,4-triazole-3-carboxylic acid2580221-52-7C19H16N4O4
- 3-Azido-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}azetidine-3-carboxylic acid2383760-74-3C19H16N4O4
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 2,5-dimethyl-1-(1-methyl-1H-pyrazol-3-yl)-1H-pyrrole-3-carboxylate2248307-56-2C19H16N4O4
- 5-[({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1H-1,2,4-triazole-3-carboxylic acid2138382-39-3C19H16N4O4
- 2-[3-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-4H-1,2,4-triazol-4-yl]acetic acid2757958-28-2C19H16N4O4
Frequently asked questions
What is the molar mass of C19H16N4O4?
The molar mass of C19H16N4O4 is 364.36 g/mol, calculated from standard atomic weights for 19 carbon atoms, 16 hydrogen atoms, 4 nitrogen atoms and 4 oxygen atoms. The monoisotopic mass is 364.1172 Da.
How many compounds have the formula C19H16N4O4?
CompoundList lists 101 compounds with the molecular formula C19H16N4O4, including Zidometacin, N'-[(E)-(1-Benzyl-2,4,6-trioxotetrahydropyrimidin-5(2H)-ylidene)methyl]benzohydrazide, 1-Methyl-7-((naphthalen-2-yloxy)methyl)-6,7-dihydrooxazolo[2,3-f]purine-2,4(1H,3H)-dione. 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 C19H16N4O4?
C19H16N4O4 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.