Molecular formula
C20H19N5OS
81 compounds have this formula on CompoundList.
- Molar mass
- 377.47g/mol
- Monoisotopic mass
- 377.1310Da
- Atoms
- 46
- Elements
- 5
- Rings plus double bonds
- 14
The formula C20H19N5OS describes a molecule made of 20 carbon atoms, 19 hydrogen atoms, 5 nitrogen atoms, 1 oxygen atom 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 × 2063.64%12.011 × 20 = 240.220 g/mol
- H Hydrogen × 195.07%1.008 × 19 = 19.152 g/mol
- N Nitrogen × 518.55%14.007 × 5 = 70.035 g/mol
- O Oxygen × 14.24%15.999 × 1 = 15.999 g/mol
- S Sulfur × 18.49%32.06 × 1 = 32.060 g/mol
Look up another formula
Compounds with the formula C20H19N5OS
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 81 of 81 compounds
![4-Allyl-1-anilino-6,7,8,9-tetrahydro[1]benzothieno[3,2-e][1,2,4]triazolo[4,3-a]pyrimidin-5(4H)-one chemical structure, C20H19N5OS, CAS 612802-51-4](/s/DPAVPDMEKWWXGR-UHFFFAOYSA-N.svg)
4-Allyl-1-anilino-6,7,8,9-tetrahydro[1]benzothieno[3,2-e][1,2,4]triazolo[4,3-a]pyrimidin-5(4H)-one
CAS 612802-51-4C20H19N5OS
3-Benzyl-8-(2-phenoxyethylsulfanyl)purin-6-amine
CAS 701967-70-6C20H19N5OS
![(6Z)-6-[(2,5-Dimethyl-1-phenylpyrrol-3-yl)methylidene]-2-ethyl-5-imino-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one chemical structure, C20H19N5OS, CAS 524739-20-6](/s/AAOBZIQQMWSLJQ-ALGNWURXSA-N.svg)
(6Z)-6-[(2,5-Dimethyl-1-phenylpyrrol-3-yl)methylidene]-2-ethyl-5-imino-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one
CAS 524739-20-6C20H19N5OS
![N-(4-{[4-(2,7-Dimethylimidazo[1,2-a]pyridin-3-yl)-1,3-thiazol-2-yl]amino}phenyl)acetamide chemical structure, C20H19N5OS, CAS 315704-21-3](/s/FLDHSBYMGAPQAH-UHFFFAOYSA-N.svg)
N-(4-{[4-(2,7-Dimethylimidazo[1,2-a]pyridin-3-yl)-1,3-thiazol-2-yl]amino}phenyl)acetamide
CAS 315704-21-3C20H19N5OS
![2-[2-[4-(1-Phenylethyl)-5-sulfanylidene-1H-1,2,4-triazol-3-yl]ethyl]phthalazin-1-one chemical structure, C20H19N5OS, CAS 838893-44-0](/s/HTPIOGMGOONUDK-UHFFFAOYSA-N.svg)
2-[2-[4-(1-Phenylethyl)-5-sulfanylidene-1H-1,2,4-triazol-3-yl]ethyl]phthalazin-1-one
CAS 838893-44-0C20H19N5OS
Anticancer agent 83
CAS 904815-29-8C20H19N5OS
![(E)-1-Phenyl-N-(9,10,11,12-tetrahydro-8H-cyclohepta[4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-2-ylmethoxy)methanimine chemical structure, C20H19N5OS, CAS 381706-31-6](/s/ZWNIUWLEEUJKER-SSDVNMTOSA-N.svg)
(E)-1-Phenyl-N-(9,10,11,12-tetrahydro-8H-cyclohepta[4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-2-ylmethoxy)methanimine
CAS 381706-31-6C20H19N5OS
![1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(5-methylpyridin-2-yl)-1H-pyrazole-3-carboxamide chemical structure, C20H19N5OS, CAS 1013805-40-7](/s/FZMMQTPYEGRJFQ-UHFFFAOYSA-N.svg)
1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(5-methylpyridin-2-yl)-1H-pyrazole-3-carboxamide
CAS 1013805-40-7C20H19N5OS
![N-(4,6-Dimethyl-1,3-benzothiazol-2-yl)-1-methyl-N-[(pyridin-3-yl)methyl]-1H-pyrazole-5-carboxamide chemical structure, C20H19N5OS, CAS 1019097-18-7](/s/OBKTZGAEVGLEBM-UHFFFAOYSA-N.svg)
N-(4,6-Dimethyl-1,3-benzothiazol-2-yl)-1-methyl-N-[(pyridin-3-yl)methyl]-1H-pyrazole-5-carboxamide
CAS 1019097-18-7C20H19N5OS
![4-[6-[(E)-2-(2-Methoxyphenyl)ethenyl]-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-3-yl]-N,N-dimethylaniline chemical structure, C20H19N5OS, CAS 895333-99-0](/s/PYPIGGPDASDSKW-JLHYYAGUSA-N.svg)
4-[6-[(E)-2-(2-Methoxyphenyl)ethenyl]-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-3-yl]-N,N-dimethylaniline
CAS 895333-99-0C20H19N5OS
![N-(5,7-Dimethyl-1,3-benzothiazol-2-yl)-1-methyl-N-[(pyridin-2-yl)methyl]-1H-pyrazole-5-carboxamide chemical structure, C20H19N5OS, CAS 1019097-09-6](/s/JUEXPDGHDHVQRZ-UHFFFAOYSA-N.svg)
N-(5,7-Dimethyl-1,3-benzothiazol-2-yl)-1-methyl-N-[(pyridin-2-yl)methyl]-1H-pyrazole-5-carboxamide
CAS 1019097-09-6C20H19N5OS
![N-[1-(1,3-Benzothiazol-2-yl)-3-methyl-1H-pyrazol-5-yl]-4-(dimethylamino)benzamide chemical structure, C20H19N5OS, CAS 1170434-37-3](/s/LWPHFAQTNPJNIK-UHFFFAOYSA-N.svg)
N-[1-(1,3-Benzothiazol-2-yl)-3-methyl-1H-pyrazol-5-yl]-4-(dimethylamino)benzamide
CAS 1170434-37-3C20H19N5OS
![N-(6-Ethylbenzo[d]thiazol-2-yl)-1-methyl-N-(pyridin-2-ylmethyl)-1H-pyrazole-3-carboxamide chemical structure, C20H19N5OS, CAS 1020489-80-8](/s/KURHPPCTBBVPMH-UHFFFAOYSA-N.svg)
N-(6-Ethylbenzo[d]thiazol-2-yl)-1-methyl-N-(pyridin-2-ylmethyl)-1H-pyrazole-3-carboxamide
CAS 1020489-80-8C20H19N5OS
![N-(4-Ethylphenyl)-2-[(2-methyl[1,2,4]triazolo[1,5-c]quinazolin-5-yl)thio]acetamide chemical structure, C20H19N5OS, CAS 443347-51-1](/s/YEAFDDDABJTAAC-UHFFFAOYSA-N.svg)
N-(4-Ethylphenyl)-2-[(2-methyl[1,2,4]triazolo[1,5-c]quinazolin-5-yl)thio]acetamide
CAS 443347-51-1C20H19N5OS
![8,8-Dimethyl-N-(pyridin-3-ylmethyl)-8,10-dihydro-7H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-4-amine chemical structure, C20H19N5OS, CAS 844826-66-0](/s/CJZOQMAXCRNNJN-UHFFFAOYSA-N.svg)
8,8-Dimethyl-N-(pyridin-3-ylmethyl)-8,10-dihydro-7H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-4-amine
CAS 844826-66-0C20H19N5OS
2-((5-(1H-Indol-3-yl)-4-methyl-4H-1,2,4-triazol-3-yl)thio)-N-benzylacetamide
CAS 831208-22-1C20H19N5OS
2-((4-Ethyl-5-(1H-indol-3-yl)-4H-1,2,4-triazol-3-yl)thio)-N-phenylacetamide
CAS 852143-60-3C20H19N5OS
![2-((5H-[1,2,4]Triazino[5,6-b]indol-3-yl)thio)-N-(3,4-dimethylphenyl)propanamide chemical structure, C20H19N5OS, CAS 332384-81-3](/s/WAFBVQSMSJTMNA-UHFFFAOYSA-N.svg)
2-((5H-[1,2,4]Triazino[5,6-b]indol-3-yl)thio)-N-(3,4-dimethylphenyl)propanamide
CAS 332384-81-3C20H19N5OS
3-(1H-Indol-1-yl)-N-(2-((4-methyl-4H-1,2,4-triazol-3-yl)thio)ethyl)benzamide
CAS 1226454-54-1C20H19N5OS
![N-(3,4-Dimethylphenyl)-2-[(2-methyl[1,2,4]triazolo[1,5-c]quinazolin-5-yl)sulfanyl]acetamide chemical structure, C20H19N5OS, CAS 925613-44-1](/s/YKRIAZPYISQQAA-UHFFFAOYSA-N.svg)
N-(3,4-Dimethylphenyl)-2-[(2-methyl[1,2,4]triazolo[1,5-c]quinazolin-5-yl)sulfanyl]acetamide
CAS 925613-44-1C20H19N5OS
![4-[(5-Benzylsulfanyl-4-methyl-1,2,4-triazol-3-yl)methyl]-2-methylphthalazin-1-one chemical structure, C20H19N5OS, CAS 210411-25-9](/s/BZUVUEKKXGQVLS-UHFFFAOYSA-N.svg)
4-[(5-Benzylsulfanyl-4-methyl-1,2,4-triazol-3-yl)methyl]-2-methylphthalazin-1-one
CAS 210411-25-9C20H19N5OS
![1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(6-methylpyridin-2-yl)-1H-pyrazole-3-carboxamide chemical structure, C20H19N5OS, CAS 1013805-35-0](/s/GTKKQFUQYKGJBF-UHFFFAOYSA-N.svg)
1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(6-methylpyridin-2-yl)-1H-pyrazole-3-carboxamide
CAS 1013805-35-0C20H19N5OS
![1-(Indolin-1-yl)-2-((7-phenyl-6,7-dihydro-5H-imidazo[2,1-c][1,2,4]triazol-3-yl)thio)ethanone chemical structure, C20H19N5OS, CAS 921881-38-1](/s/YQPQZCQMLUOPMU-UHFFFAOYSA-N.svg)
1-(Indolin-1-yl)-2-((7-phenyl-6,7-dihydro-5H-imidazo[2,1-c][1,2,4]triazol-3-yl)thio)ethanone
CAS 921881-38-1C20H19N5OS
![6-[1,1'-Biphenyl]-4-yl-3-(4-morpholinylmethyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole chemical structure, C20H19N5OS, CAS 1190291-72-5](/s/CXEOBARDKHFYEA-UHFFFAOYSA-N.svg)
6-[1,1'-Biphenyl]-4-yl-3-(4-morpholinylmethyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole
CAS 1190291-72-5C20H19N5OS
- (E)-1-(4-(6-(Pyridin-3-yl)pyridazin-3-yl)piperazin-1-yl)-3-(thiophen-2-yl)prop-2-en-1-one1257556-16-3C20H19N5OS
- 1-Phenyl-5-(1H-pyrrol-1-yl)-N-[1-(2-thienyl)propyl]-1H-1,2,3-triazole-4-carboxamide1798617-81-8C20H19N5OS
- 8-Hydrazinyl-2,2-dimethyl-5-phenyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine4645-72-1C20H19N5OS
- 2-((5-(1H-Indol-3-yl)-4-methyl-4H-1,2,4-triazol-3-yl)thio)-N-(o-tolyl)acetamide852142-11-1C20H19N5OS
- 2-((5-(1H-Indol-3-yl)-4-methyl-4H-1,2,4-triazol-3-yl)thio)-N-(p-tolyl)acetamide852142-13-3C20H19N5OS
- 2-((5-(1H-Indol-3-yl)-4-methyl-4H-1,2,4-triazol-3-yl)thio)-N-(m-tolyl)acetamide852142-12-2C20H19N5OS
- 4-[6-[(E)-2-(4-Methoxyphenyl)ethenyl]-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-3-yl]-N,N-dimethylaniline895334-03-9C20H19N5OS
- 1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(pyridin-3-ylmethyl)-1H-pyrazole-3-carboxamide1013806-55-7C20H19N5OS
- 1-(3,4-Dimethylphenyl)-4-[4-(3-methoxyphenyl)-1,3-thiazol-2-yl]-1H-1,2,3-triazol-5-amine1111432-78-0C20H19N5OS
- 1-(3,4-Dimethylphenyl)-4-[4-(2-methoxyphenyl)-1,3-thiazol-2-yl]-1H-1,2,3-triazol-5-amine1111280-81-9C20H19N5OS
- N-(2,6-Dimethylphenyl)-2-({1-methyl-[1,2,4]triazolo[4,3-a]quinoxalin-4-yl}sulfanyl)acetamide1251688-19-3C20H19N5OS
- (E)-1-(4-(6-(Pyridin-2-yl)pyridazin-3-yl)piperazin-1-yl)-3-(thiophen-2-yl)prop-2-en-1-one1257556-15-2C20H19N5OS
- N-((1-(3-Cyanopyridin-2-yl)piperidin-4-yl)methyl)benzo[d]thiazole-2-carboxamide1797955-08-8C20H19N5OS
- 1-Benzyl-5-(1H-pyrrol-1-yl)-N-[2-(thiophen-2-yl)ethyl]-1H-1,2,3-triazole-4-carboxamide1795299-95-4C20H19N5OS
- N-[4-(3-Methyl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-6-yl)phenyl]-4-propan-2-ylbenzamide701248-71-7C20H19N5OS
- 1-(2,3-Dihydroindol-1-yl)-2-[(4-prop-2-enyl-5-pyridin-4-yl-1,2,4-triazol-3-yl)sulfanyl]ethanone561047-74-3C20H19N5OS
- 1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(pyridin-2-ylmethyl)-1H-pyrazole-3-carboxamide1013806-45-5C20H19N5OS
- (4-((1H-Benzo[d]imidazol-2-yl)methyl)piperazin-1-yl)(benzo[d]thiazol-2-yl)methanone1171939-74-4C20H19N5OS
- 1-(3,4-Dimethylphenyl)-4-[4-(4-methoxyphenyl)-1,3-thiazol-2-yl]-1H-1,2,3-triazol-5-amine1207024-57-4C20H19N5OS
- N-[4-(Propan-2-yl)phenyl]-2-{[1,2,4]triazolo[4,3-a]quinoxalin-4-ylsulfanyl}acetamide1358919-51-3C20H19N5OS
- N-(3,4-Dimethylphenyl)-2-({1-methyl-[1,2,4]triazolo[4,3-A]quinoxalin-4-YL}sulfanyl)acetamide1358919-60-4C20H19N5OS
- (3-(1H-Benzo[d]imidazol-1-yl)pyrrolidin-1-yl)(1-methyl-3-(thiophen-2-yl)-1H-pyrazol-5-yl)methanone2034289-91-1C20H19N5OS
- (6E)-6-[[1-(4-Ethylphenyl)-2,5-dimethylpyrrol-3-yl]methylidene]-5-imino-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one690992-37-1C20H19N5OS
- 2-[[1-(2,4-Dimethylphenyl)-1H-tetrazol-5-yl]thio]-1-(2-methyl-1H-indol-3-yl)ethanone721415-07-2C20H19N5OS
- 7-[(2,5-Dimethylphenyl)methylsulfanyl]-3-(4-methoxyphenyl)triazolo[4,5-d]pyrimidine863500-82-7C20H19N5OS
- 1-(Benzo[d]thiazol-2-yl)-5-isopropyl-N-(3-methylpyridin-2-yl)-1H-pyrazole-3-carboxamide1013805-53-2C20H19N5OS
- 4-(1-Benzyl-1H-pyrazol-4-yl)-5-[(2-methylphenoxy)methyl]-4H-1,2,4-triazole-3-thiol1005664-51-6C20H19N5OS
- N-(4-Ethylphenyl)-2-({1-methyl-[1,2,4]triazolo[4,3-A]quinoxalin-4-YL}sulfanyl)acetamide1189715-22-7C20H19N5OS
- N-(2,4-Dimethylphenyl)-2-((1-methyl-[1,2,4]triazolo[4,3-a]quinoxalin-4-yl)thio)acetamide1358481-43-2C20H19N5OS
- 2-((1-Methyl-[1,2,4]triazolo[4,3-a]quinoxalin-4-yl)thio)-N-(4-methylbenzyl)acetamide1359474-36-4C20H19N5OS
- 2-((1-Methyl-[1,2,4]triazolo[4,3-a]quinoxalin-4-yl)thio)-N-phenethylacetamide1358481-61-4C20H19N5OS
- N-(1H-Benzo[d]imidazol-2-yl)-4-methyl-2-(2-propylpyridin-4-yl)thiazole-5-carboxamide1324081-39-1C20H19N5OS
- 2-(1H-Benzo[d][1,2,3]triazol-1-yl)-N-((4-methyl-2-(o-tolyl)thiazol-5-yl)methyl)acetamide1448056-23-2C20H19N5OS
- 11-(2-Ethyl-1,3-benzothiazole-6-carbonyl)-4-methyl-2,3,7,11-tetraazatricyclo[7.4.0.0^{2,6}]trideca-1(9),3,5,7-tetraene1797189-97-9C20H19N5OS
- 5-Methyl-1-phenyl-N-{2-[3-(thiophen-3-yl)-1H-pyrazol-1-yl]ethyl}-1H-pyrazole-4-carboxamide2034451-34-6C20H19N5OS
- N-(2-(3,5-Dimethyl-1-(pyridin-2-yl)-1H-pyrazol-4-yl)ethyl)benzo[d]thiazole-2-carboxamide2034256-92-1C20H19N5OS
- 2-Ethyl-N-((5-(1-methyl-1H-pyrazol-5-yl)pyridin-3-yl)methyl)benzo[d]thiazole-6-carboxamide2177365-83-0C20H19N5OS
- 2-Ethyl-N-((2-(1-methyl-1H-pyrazol-4-yl)pyridin-3-yl)methyl)benzo[d]thiazole-6-carboxamide2176270-41-8C20H19N5OS
- 1-(2,3-Dihydro-1H-indol-1-yl)-2-{[4-(prop-2-en-1-yl)-5-(pyridin-3-yl)-4H-1,2,4-triazol-3-yl]sulfanyl}ethanone879743-65-4C20H19N5OS
- 1-(1-Ethyl-1H-indol-3-yl)-2-{[4-methyl-5-(pyridin-4-yl)-4H-1,2,4-triazol-3-yl]sulfanyl}ethanone924972-96-3C20H19N5OS
- 1-Benzyl-4-[3-(3-methylphenyl)-1,2,4-oxadiazol-5-yl]-3-(methylsulfanyl)-1H-pyrazol-5-amine1242969-31-8C20H19N5OS
- N-[2-(3,5-Dimethyl-4-phenyl-1H-pyrazol-1-yl)ethyl]-2,1,3-benzothiadiazole-5-carboxamide2097864-80-5C20H19N5OS
- 2-({[5-Phenyl-4-(propan-2-yl)-4H-1,2,4-triazol-3-yl]sulfanyl}methyl)quinazolin-4(1H)-one1266378-05-5C20H19N5OS
- Acetamide, 2-[(1-cyclopropyl-1H-imidazol-2-yl)thio]-N-[4-(2-phenyldiazenyl)phenyl]-938381-53-4C20H19N5OS
- N-2-Benzothiazolyl-N-[2-(dimethylamino)ethyl]-2-quinoxalinecarboxamide1171097-23-6C20H19N5OS
- 2-Cyano-3-(3,5-dimethyl-1H-pyrazol-4-yl)-N-[4-(2,5-dimethylphenyl)-1,3-thiazol-2-yl]prop-2-enamide1239891-39-4C20H19N5OS
- 5-[3-[6-(4-Morpholinyl)-2-pyridinyl]-1H-indol-5-yl]-2-thiazolamine1401347-36-1C20H19N5OS
- 2-(1-Methyl-1H-indol-3-yl)-N-(1-{thieno[3,2-d]pyrimidin-4-yl}azetidin-3-yl)acetamide2380180-42-5C20H19N5OS
- 2-[5-(2-Phenyl-1,3-thiazole-4-carbonyl)-octahydropyrrolo[3,4-c]pyrrol-2-yl]pyrazine2415469-59-7C20H19N5OS
- Igf2BP3-IN-13070282-38-8C20H19N5OS
- 2-[4-(4-Methyl-1,3-benzothiazol-2-yl)piperazin-1-yl]-4H-pyrido[1,2-a]pyrimidin-4-one2640961-44-8C20H19N5OS
- 2-[4-(1,3-Benzothiazol-2-yl)piperazin-1-yl]-3-methyl-3,4-dihydroquinazolin-4-one2640873-31-8C20H19N5OS
- 2-[4-(1,3-Benzothiazol-2-yl)piperazin-1-yl]-5H,7H,8H-pyrano[4,3-b]pyridine-3-carbonitrile2742022-72-4C20H19N5OS
- 2-[5-(5-Methoxy-1,3-benzothiazol-2-yl)-octahydropyrrolo[3,4-c]pyrrol-2-yl]pyridine-3-carbonitrile2742041-93-4C20H19N5OS
- 2-[5-(4-Methoxy-1,3-benzothiazol-2-yl)-octahydropyrrolo[3,4-c]pyrrol-2-yl]pyridine-3-carbonitrile2742041-43-4C20H19N5OS
- 2-[4-(1,2-Benzothiazol-3-yl)piperazin-1-yl]-N-(2-cyanophenyl)acetamide3054607-27-8C20H19N5OS
- 6-[(2,5-Dimethyl-1-phenylpyrrol-3-yl)methylidene]-2-ethyl-5-imino-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-oneC20H19N5OS
Frequently asked questions
What is the molar mass of C20H19N5OS?
The molar mass of C20H19N5OS is 377.47 g/mol, calculated from standard atomic weights for 20 carbon atoms, 19 hydrogen atoms, 5 nitrogen atoms, 1 oxygen atom and 1 sulfur atom. The monoisotopic mass is 377.1310 Da.
How many compounds have the formula C20H19N5OS?
CompoundList lists 81 compounds with the molecular formula C20H19N5OS, including 4-Allyl-1-anilino-6,7,8,9-tetrahydro[1]benzothieno[3,2-e][1,2,4]triazolo[4,3-a]pyrimidin-5(4H)-one, 3-Benzyl-8-(2-phenoxyethylsulfanyl)purin-6-amine, (6Z)-6-[(2,5-Dimethyl-1-phenylpyrrol-3-yl)methylidene]-2-ethyl-5-imino-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-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 C20H19N5OS?
C20H19N5OS 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.