Molecular formula
C19H21N5O
259 compounds have this formula on CompoundList.
- Molar mass
- 335.41g/mol
- Monoisotopic mass
- 335.1746Da
- Atoms
- 46
- Elements
- 4
- Rings plus double bonds
- 12
The formula C19H21N5O describes a molecule made of 19 carbon atoms, 21 hydrogen atoms, 5 nitrogen atoms and 1 oxygen 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 × 1968.04%12.011 × 19 = 228.209 g/mol
- H Hydrogen × 216.31%1.008 × 21 = 21.168 g/mol
- N Nitrogen × 520.88%14.007 × 5 = 70.035 g/mol
- O Oxygen × 14.77%15.999 × 1 = 15.999 g/mol
Look up another formula
Compounds with the formula C19H21N5O
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 259 compounds
![11-Methyl-13-{[2-(morpholin-4-yl)ethyl]amino}-1,8-diazatricyclo[7.4.0.0^{2,7}]trideca-2(7),3,5,8,10,12-hexaene-10-carbonitrile chemical structure, C19H21N5O, CAS 305331-49-1](/s/WESCNKPYTMFUIY-UHFFFAOYSA-N.svg)
11-Methyl-13-{[2-(morpholin-4-yl)ethyl]amino}-1,8-diazatricyclo[7.4.0.0^{2,7}]trideca-2(7),3,5,8,10,12-hexaene-10-carbonitrile
CAS 305331-49-1C19H21N5O
![6-Amino-1'-benzyl-3-methylspiro[2H-pyrano[2,3-c]pyrazole-4,4'-piperidine]-5-carbonitrile chemical structure, C19H21N5O, CAS 302818-13-9](/s/YIJIDZQZAFLHKO-UHFFFAOYSA-N.svg)
6-Amino-1'-benzyl-3-methylspiro[2H-pyrano[2,3-c]pyrazole-4,4'-piperidine]-5-carbonitrile
CAS 302818-13-9C19H21N5O
5-Amino-N-(2,3-dimethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide
CAS 902470-15-9C19H21N5O
![4,5-Dihydro-2-[4-(4-methyl-1H-imidazol-5-yl)-1-piperidinyl]-6H-imidazo[4,5,1-ij]quinolin-6-one chemical structure, C19H21N5O, CAS 163120-31-8](/s/YKJJROIKVYSPDH-UHFFFAOYSA-N.svg)
4,5-Dihydro-2-[4-(4-methyl-1H-imidazol-5-yl)-1-piperidinyl]-6H-imidazo[4,5,1-ij]quinolin-6-one
CAS 163120-31-8C19H21N5O
5-Amino-N-(2,3-dimethylphenyl)-1-(2-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide
CAS 902556-65-4C19H21N5O
5-Amino-N-(2,5-dimethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide
CAS 902556-57-4C19H21N5O
N'-(4-Isopropylbenzylidene)-3-(1-ME-1H-pyrrol-2-yl)-1H-pyrazole-5-carbohydrazide
CAS 303095-22-9C19H21N5O
N'-(4-(Diethylamino)benzylidene)-1H-benzimidazole-6-carbohydrazide
CAS 500107-14-2C19H21N5O
![1-[4-(2-Hydroxyethyl)piperazin-1-yl]-3-methylpyrido[1,2-a]benzimidazole-4-carbonitrile chemical structure, C19H21N5O, CAS 384367-39-9](/s/AWVYNJKTWVQEMH-UHFFFAOYSA-N.svg)
1-[4-(2-Hydroxyethyl)piperazin-1-yl]-3-methylpyrido[1,2-a]benzimidazole-4-carbonitrile
CAS 384367-39-9C19H21N5O
![5-Amino-N-(2,5-dimethylphenyl)-1-[(3-methylphenyl)methyl]-1H-1,2,3-triazole-4-carboxamide chemical structure, C19H21N5O, CAS 902556-61-0](/s/JSVDWMNYJSXGRR-UHFFFAOYSA-N.svg)
5-Amino-N-(2,5-dimethylphenyl)-1-[(3-methylphenyl)methyl]-1H-1,2,3-triazole-4-carboxamide
CAS 902556-61-0C19H21N5O
2-(1-Methyl-1H-indol-3-yl)-1-(4-(pyrimidin-2-yl)piperazin-1-yl)ethanone
CAS 1172701-11-9C19H21N5O
5-Amino-1-(3,5-dimethylphenyl)-N-(2-phenylethyl)-1H-1,2,3-triazole-4-carboxamide
CAS 443111-71-5C19H21N5O
![4-[[4-(4-Methylpiperazin-1-yl)quinazolin-2-yl]amino]phenol chemical structure, C19H21N5O, CAS 690696-36-7](/s/VTHMRLOUPKJVSL-UHFFFAOYSA-N.svg)
4-[[4-(4-Methylpiperazin-1-yl)quinazolin-2-yl]amino]phenol
CAS 690696-36-7C19H21N5O
N-Pentyl-1-phenyl-5-(pyridin-4-yl)-1H-1,2,3-triazole-4-carboxamide
CAS 1189452-07-0C19H21N5O
![Benzamide, 4-[2-[(6-amino-4-quinazolinyl)amino]ethyl]-N,N-dimethyl- chemical structure, C19H21N5O, CAS 647376-38-3](/s/ZLMDOAYCAUGSOY-UHFFFAOYSA-N.svg)
Benzamide, 4-[2-[(6-amino-4-quinazolinyl)amino]ethyl]-N,N-dimethyl-
CAS 647376-38-3C19H21N5O
![6-Methyl-N-(4-methylphenyl)-4-(pyrrolidin-1-yl)pyrazolo[1,5-a]pyrazine-2-carboxamide chemical structure, C19H21N5O, CAS 1775378-19-2](/s/QDMFKEOYCRRRSU-UHFFFAOYSA-N.svg)
6-Methyl-N-(4-methylphenyl)-4-(pyrrolidin-1-yl)pyrazolo[1,5-a]pyrazine-2-carboxamide
CAS 1775378-19-2C19H21N5O
![N-Cyclopropyl-4-[8-[(1-methylethyl)amino]imidazo[1,2-a]pyrazin-3-yl]benzamide chemical structure, C19H21N5O, CAS 1263421-37-9](/s/AAWLWBPMILFOPZ-UHFFFAOYSA-N.svg)
N-Cyclopropyl-4-[8-[(1-methylethyl)amino]imidazo[1,2-a]pyrazin-3-yl]benzamide
CAS 1263421-37-9C19H21N5O
![(4r)-2-Amino-1,3',3'-Trimethyl-7'-(Pyrimidin-5-Yl)-3',4'-Dihydro-2'H-Spiro[imidazole-4,1'-Naphthalen]-5(1H)-One chemical structure, C19H21N5O, CAS 1338092-74-2](/s/UPOMBIAVTOFWMY-LJQANCHMSA-N.svg)
(4r)-2-Amino-1,3',3'-Trimethyl-7'-(Pyrimidin-5-Yl)-3',4'-Dihydro-2'H-Spiro[imidazole-4,1'-Naphthalen]-5(1H)-One
CAS 1338092-74-2C19H21N5O
![N-(3-(3-Methyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)phenyl)cyclohexanecarboxamide chemical structure, C19H21N5O, CAS 894053-48-6](/s/JMBULWVZHUCRKW-UHFFFAOYSA-N.svg)
N-(3-(3-Methyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)phenyl)cyclohexanecarboxamide
CAS 894053-48-6C19H21N5O
![3-(1H-Imidazol-1-yl)-6-[4-(2-methylphenoxy)piperidin-1-yl]pyridazine chemical structure, C19H21N5O, CAS 921606-82-8](/s/MMHAEMWFIAWWKB-UHFFFAOYSA-N.svg)
3-(1H-Imidazol-1-yl)-6-[4-(2-methylphenoxy)piperidin-1-yl]pyridazine
CAS 921606-82-8C19H21N5O
![3-(1H-Imidazol-1-yl)-6-[4-(3-methylphenoxy)piperidin-1-yl]pyridazine chemical structure, C19H21N5O, CAS 921606-80-6](/s/RRCKJQMBMBSBQD-UHFFFAOYSA-N.svg)
3-(1H-Imidazol-1-yl)-6-[4-(3-methylphenoxy)piperidin-1-yl]pyridazine
CAS 921606-80-6C19H21N5O
![2-[(4,6,7-Trimethylquinazolin-2-yl)amino]-5,6,7,8-tetrahydroquinazolin-4(1H)-one chemical structure, C19H21N5O, CAS 487035-73-4](/s/CPFBNAWOMCZVEI-UHFFFAOYSA-N.svg)
2-[(4,6,7-Trimethylquinazolin-2-yl)amino]-5,6,7,8-tetrahydroquinazolin-4(1H)-one
CAS 487035-73-4C19H21N5O
![5-Allyl-6-methyl-2-[(4,6,7-trimethylquinazolin-2-yl)amino]pyrimidin-4(3H)-one chemical structure, C19H21N5O, CAS 924874-35-1](/s/HWOCUFUUELZULG-UHFFFAOYSA-N.svg)
5-Allyl-6-methyl-2-[(4,6,7-trimethylquinazolin-2-yl)amino]pyrimidin-4(3H)-one
CAS 924874-35-1C19H21N5O
![(E)-3-(1H-Benzo[d]imidazol-1-yl)-N'-(4-(dimethylamino)benzylidene)propanehydrazide chemical structure, C19H21N5O, CAS 518018-63-8](/s/WISXBNXLCVGCAJ-FYJGNVAPSA-N.svg)
(E)-3-(1H-Benzo[d]imidazol-1-yl)-N'-(4-(dimethylamino)benzylidene)propanehydrazide
CAS 518018-63-8C19H21N5O
- 5-Amino-1-benzyl-N-(4-isopropylphenyl)-1H-1,2,3-triazole-4-carboxamide899750-02-8C19H21N5O
- 5-Amino-N-(2,4-dimethylphenyl)-1-(2-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide845867-34-7C19H21N5O
- 1-(4-Isopropylphenyl)-5-methyl-N-(pyridin-3-ylmethyl)-1H-1,2,3-triazole-4-carboxamide950248-69-8C19H21N5O
- 5-Amino-N-(4-ethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide900013-50-5C19H21N5O
- 5-Amino-N-benzyl-1-[4-(propan-2-yl)phenyl]-1H-1,2,3-triazole-4-carboxamide1032229-77-8C19H21N5O
- N-{3-[(1-Phenyl-1H-tetrazol-5-yl)oxy]benzyl}cyclopentanamine932259-79-5C19H21N5O
- N-((2'-(1H-Tetrazol-5-yl)-[1,1'-biphenyl]-4-yl)methyl)pentanamide914465-68-2C19H21N5O
- 5-Amino-N-(3,5-dimethylphenyl)-1-(3-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide902470-16-0C19H21N5O
- N-(2,4-Dimethylphenyl)-3-(3-methylphenyl)-2-(2H-tetrazol-5-yl)propanamide483993-87-9C19H21N5O
- N-(3,5-Dimethylphenyl)-3-(3-methylphenyl)-2-(2H-tetrazol-5-yl)propanamide483993-88-0C19H21N5O
- N-(2,5-Dimethylphenyl)-3-(3-methylphenyl)-2-(2H-tetrazol-5-yl)propanamide483993-89-1C19H21N5O
- N-(2-Ethylphenyl)-3-(3-methylphenyl)-2-(2H-tetrazol-5-yl)propanamide483993-91-5C19H21N5O
- 5-Amino-N-(3,5-dimethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide845867-39-2C19H21N5O
- 5-Amino-N-(2,6-dimethylphenyl)-1-(3,5-dimethylphenyl)-1H-1,2,3-triazole-4-carboxamide1032229-37-0C19H21N5O
- 4-((1H-Benzo[d]imidazol-2-yl)methyl)-N-phenylpiperazine-1-carboxamide1207007-58-6C19H21N5O
- 3-(3-Methylphenyl)-5-[(4-pyridin-2-ylpiperazin-1-yl)methyl]-1,2,4-oxadiazole876893-36-6C19H21N5O
- N-(3,4-Dimethylphenyl)-3-(3-methylphenyl)-2-(2H-tetrazol-5-yl)propanamide483993-86-8C19H21N5O
- 2-Cyclohexyl-N-(3-{[1,2,4]triazolo[4,3-b]pyridazin-6-yl}phenyl)acetamide894063-45-7C19H21N5O
- 1-(2-Methyl-1H-indol-3-yl)-2-(4-pyrimidin-2-ylpiperazin-1-yl)ethanone892720-72-8C19H21N5O
- N-(2-Ethyl-6-methylphenyl)-2-[5-(2-methylphenyl)-2H-tetrazol-2-yl]acetamide876578-46-0C19H21N5O
- 5-Amino-1-(2,5-dimethylphenyl)-N-(2-phenylethyl)-1H-1,2,3-triazole-4-carboxamide1032229-89-2C19H21N5O
- N-((4-(1H-Benzo[d]imidazol-2-yl)cyclohexyl)methyl)pyrazine-2-carboxamide1234946-61-2C19H21N5O
- 5-Amino-1-(3,4-dimethylphenyl)-N-(4-ethylphenyl)-1H-1,2,3-triazole-4-carboxamide1260938-73-5C19H21N5O
- N-(2-((6-(1H-Pyrrol-1-yl)pyridazin-3-yl)amino)ethyl)-3-phenylpropanamide1428348-74-6C19H21N5O
- 4-(Azepan-1-yl)-N-(1H-indazol-6-yl)pyridine-2-carboxamide1421497-05-3C19H21N5O
- N-(1-tert-Butyl-4-cyano-1H-pyrrol-2-yl)-2-{8-methylimidazo[1,2-a]pyridin-2-yl}acetamide1384808-61-0C19H21N5O
- 5-Methyl-1-phenyl-N-((4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-3-yl)methyl)-1H-pyrazole-4-carboxamide2034265-25-1C19H21N5O
- N-(2-Ethyl-6-methylphenyl)-2-[5-(4-methylphenyl)-2H-tetrazol-2-yl]acetamide926157-57-5C19H21N5O
- N-(4-Butylphenyl)-2-(5-phenyl-2H-tetrazol-2-yl)acetamide950230-16-7C19H21N5O
- 4-(3-Amino-4-(4-methylpiperazin-1-yl)phenyl)phthalazin-1(2H)-one1147012-96-1C19H21N5O
- 5-Methyl-1-[4-(propan-2-yl)phenyl]-N-(pyridin-2-ylmethyl)-1H-1,2,3-triazole-4-carboxamide950227-69-7C19H21N5O
- 5-Amino-N-(2,5-dimethylphenyl)-1-(3,5-dimethylphenyl)-1H-1,2,3-triazole-4-carboxamide1032226-96-2C19H21N5O
- 5-Amino-1-(2,5-dimethylphenyl)-N-(2,6-dimethylphenyl)-1H-1,2,3-triazole-4-carboxamide1032229-83-6C19H21N5O
- 5-Amino-1-(3,5-dimethylphenyl)-N-(2-ethylphenyl)-1H-1,2,3-triazole-4-carboxamide1032226-73-5C19H21N5O
- 4-(1H-Benzo[d]imidazol-2-yl)-N-benzylpiperazine-1-carboxamide1210351-77-1C19H21N5O
- N-(2-Methylpropyl)-3-[4-(2-pyridinylamino)phenoxy]-2-pyrazinamine1231921-80-4C19H21N5O
- 5-((4-Ethylphenyl)amino)-N-(1-phenylethyl)-1H-1,2,3-triazole-4-carboxamide1291863-08-5C19H21N5O
- 5-((4-Ethylphenyl)amino)-N-(2-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide1291860-32-6C19H21N5O
- N-Benzyl-5-[(3,4-dimethylphenyl)amino]-N-methyl-1H-1,2,3-triazole-4-carboxamide1291854-27-7C19H21N5O
- 6-Cyclopropyl-N-(3-methylpyridin-2-yl)-1-(propan-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxamide1282128-19-1C19H21N5O
- 2-Phenyl-2-(1H-pyrazol-1-yl)-1-{2-[(1H-pyrazol-1-yl)methyl]pyrrolidin-1-yl}ethan-1-one1333675-35-6C19H21N5O
- N-(2-(1H-Indol-3-yl)ethyl)-6-(pyrrolidin-1-yl)pyridazine-3-carboxamide1396784-88-5C19H21N5O
- 6-(3,5-Dimethyl-1H-pyrazol-1-yl)-N-(2-isopropylphenyl)pyridazine-3-carboxamide1351647-15-8C19H21N5O
- 2-(1H-Indol-3-yl)-N-[6-(piperidin-1-yl)pyrimidin-4-yl]acetamide1396849-47-0C19H21N5O
- N-(2-((6-(1H-Pyrrol-1-yl)pyridazin-3-yl)amino)ethyl)-4-ethylbenzamide1421484-37-8C19H21N5O
- N-(2-Phenylethyl)-4-[2-(propan-2-yl)-2H-tetrazol-5-yl]benzamide1574363-02-2C19H21N5O
- 1-Methyl-3-phenyl-N-((4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-3-yl)methyl)-1H-pyrazole-5-carboxamide2034588-46-8C19H21N5O
- 2-[(4,6-Dimethylpyrimidin-2-yl)amino]-1-(1,3,4,9-tetrahydro-2H-beta-carbolin-2-yl)ethanone1630836-67-7C19H21N5O
- 5-Methyl-N-((2-methyl-2,4,5,6-tetrahydrocyclopenta[c]pyrazol-3-yl)methyl)-1-phenyl-1H-pyrazole-4-carboxamide2034289-58-0C19H21N5O
- 4-(3-((1R,5S)-3-(2H-1,2,3-Triazol-2-yl)-8-azabicyclo[3.2.1]octan-8-yl)-3-oxopropyl)benzonitrile2109265-71-4C19H21N5O
- 9-[1-(Prop-2-yn-1-yl)piperidine-4-carbonyl]-3,4,5,9-tetraazatricyclo[8.4.0.0^{3,7}]tetradeca-1(10),4,6,11,13-pentaene2093925-80-3C19H21N5O
- 1,3-Dimethyl-N-(2-(5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-2-yl)phenyl)-1H-pyrazole-5-carboxamide2097900-75-7C19H21N5O
- N-Cyclopropyl-3-[1-(1,2-dimethyl-1H-imidazol-5-yl)-1H-pyrazol-4-yl]-4-methylbenzamide2205041-01-4C19H21N5O
- Ppar|A-IN-22682078-97-1C19H21N5O
- N-(4-{3-Methyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl}phenyl)cyclohexanecarboxamide894068-52-1C19H21N5O
- (E)-2-Cyano-3-(3-methyl-1-phenyl-5-piperidin-1-ylpyrazol-4-yl)prop-2-enamide877971-99-8C19H21N5O
- 4-Quinazolinamine, N-[2-(4-morpholinyl)ethyl]-2-(2-pyridinyl)-831226-67-6C19H21N5O
- 5-Amino-N-(2,4-dimethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide845867-38-1C19H21N5O
- (4,7-Dimethyl-8-phenylpyrazolo[5,1-c][1,2,4]triazin-3-yl)(piperidin-1-yl)methanone903460-81-1C19H21N5O
- 5-Amino-N-(2,6-dimethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide902470-11-5C19H21N5O
- 3-Methyl-N-{[2-(morpholin-4-yl)pyridin-4-yl]methyl}quinoxalin-2-amine2192746-81-7C19H21N5O
- 2-Phenyl-N-((1-(p-tolyl)-1H-tetrazol-5-yl)methyl)butanamide920461-00-3C19H21N5O
- 1-Isopropyl-N-(3-methylpyridin-2-yl)-1,5,6,7-tetrahydrocyclopenta[b]pyrazolo[4,3-e]pyridine-4-carboxamide1179462-99-7C19H21N5O
- 2-(4-Isopropylphenyl)-N-[phenyl(1H-tetrazol-5-yl)methyl]acetamide1298054-44-0C19H21N5O
- 5-[(4-Methylphenyl)amino]-N-[4-(propan-2-yl)phenyl]-1H-1,2,3-triazole-4-carboxamide1189662-19-8C19H21N5O
- 1-[4-[2-(2-Methylphenyl)pyrazolo[1,5-a]pyrazin-4-yl]piperazin-1-yl]ethanone1326853-39-7C19H21N5O
- 3-(5-Methyl-1H-tetrazol-1-yl)-N-(4-phenylbutan-2-yl)benzamide1324059-11-1C19H21N5O
- 1-(3,4-Dihydroisoquinolin-2(1H)-yl)-3-(6,8-dimethyl[1,2,4]triazolo[4,3-b]pyridazin-7-yl)propan-1-one1324059-29-1C19H21N5O
- 1-Cyclopentyl-6-methyl-N-(pyridin-3-ylmethyl)-1H-pyrazolo[3,4-b]pyridine-4-carboxamide1435906-32-3C19H21N5O
- 3-(Dimethylamino)-N-((1-methyl-5-(pyridin-4-yl)-1H-pyrazol-3-yl)methyl)benzamide1421524-22-2C19H21N5O
- N-(2-((6-(1H-Pyrrol-1-yl)pyridazin-3-yl)amino)ethyl)-2,5-dimethylbenzamide1421529-98-7C19H21N5O
- N-(2-((6-(1H-Pyrrol-1-yl)pyrimidin-4-yl)amino)ethyl)-3-phenylpropanamide1421448-98-7C19H21N5O
- N-(2-{[2-Methyl-6-(1H-pyrrol-1-yl)pyrimidin-4-yl]amino}ethyl)-2-phenylacetamide1396685-54-3C19H21N5O
- 1-(3,4-Dimethylphenyl)-3-{2-[3-(pyridin-2-yl)-1H-pyrazol-1-yl]ethyl}urea1448026-88-7C19H21N5O
- 4-Phenyl-N-(2-(2-(pyrimidin-2-yl)-1H-imidazol-1-yl)ethyl)butanamide1448030-54-3C19H21N5O
- 2-Phenyl-N-(2-(2-(pyrimidin-2-yl)-1H-imidazol-1-yl)ethyl)butanamide1448054-21-4C19H21N5O
Frequently asked questions
What is the molar mass of C19H21N5O?
The molar mass of C19H21N5O is 335.41 g/mol, calculated from standard atomic weights for 19 carbon atoms, 21 hydrogen atoms, 5 nitrogen atoms and 1 oxygen atom. The monoisotopic mass is 335.1746 Da.
How many compounds have the formula C19H21N5O?
CompoundList lists 259 compounds with the molecular formula C19H21N5O, including 11-Methyl-13-{[2-(morpholin-4-yl)ethyl]amino}-1,8-diazatricyclo[7.4.0.0^{2,7}]trideca-2(7),3,5,8,10,12-hexaene-10-carbonitrile, 6-Amino-1'-benzyl-3-methylspiro[2H-pyrano[2,3-c]pyrazole-4,4'-piperidine]-5-carbonitrile, 5-Amino-N-(2,3-dimethylphenyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole-4-carboxamide. 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 C19H21N5O?
C19H21N5O has a degree of unsaturation of 12. 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.