Molecular formula
C19H18N2O5S
128 compounds have this formula on CompoundList.
- Molar mass
- 386.42g/mol
- Monoisotopic mass
- 386.0936Da
- Atoms
- 45
- Elements
- 5
- Rings plus double bonds
- 12
The formula C19H18N2O5S describes a molecule made of 19 carbon atoms, 18 hydrogen atoms, 2 nitrogen atoms, 5 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 × 1959.06%12.011 × 19 = 228.209 g/mol
- H Hydrogen × 184.70%1.008 × 18 = 18.144 g/mol
- N Nitrogen × 27.25%14.007 × 2 = 28.014 g/mol
- O Oxygen × 520.70%15.999 × 5 = 79.995 g/mol
- S Sulfur × 18.30%32.06 × 1 = 32.060 g/mol
Look up another formula
Compounds with the formula C19H18N2O5S
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 128 compounds
Zinquin
CAS 151606-29-0C19H18N2O5S
![N-(2-Furylmethyl)-4-{[(3-methoxyphenyl)sulfonyl]amino}benzamide chemical structure, C19H18N2O5S, CAS 690962-42-6](/s/RJSXHPRSGHSKFN-UHFFFAOYSA-N.svg)
N-(2-Furylmethyl)-4-{[(3-methoxyphenyl)sulfonyl]amino}benzamide
CAS 690962-42-6C19H18N2O5S
![Ethyl 4-[4-(furan-2-carbonyloxy)phenyl]-6-methyl-2-sulfanylidene-3,4-dihydro-1H-pyrimidine-5-carboxylate chemical structure, C19H18N2O5S, CAS 6240-68-2](/s/ALELAPFILLZPRJ-UHFFFAOYSA-N.svg)
Ethyl 4-[4-(furan-2-carbonyloxy)phenyl]-6-methyl-2-sulfanylidene-3,4-dihydro-1H-pyrimidine-5-carboxylate
CAS 6240-68-2C19H18N2O5S
Anti-Influenza agent 4
CAS 522625-85-0C19H18N2O5S
(S)-5-(2-Phenoxymethyl-pyrrolidine-1-sulfonyl)-1H-indole-2,3-dione
CAS 220509-98-8C19H18N2O5S
![N-(Benzo[d][1,3]dioxol-5-yl)-2-((1-ethyl-1H-indol-3-yl)sulfonyl)acetamide chemical structure, C19H18N2O5S, CAS 686743-76-0](/s/KXWGHHJYEGDFSN-UHFFFAOYSA-N.svg)
N-(Benzo[d][1,3]dioxol-5-yl)-2-((1-ethyl-1H-indol-3-yl)sulfonyl)acetamide
CAS 686743-76-0C19H18N2O5S
![N-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-2-((1-methyl-1H-indol-3-yl)sulfonyl)acetamide chemical structure, C19H18N2O5S, CAS 686743-53-3](/s/GDROQXFQSXNBIS-UHFFFAOYSA-N.svg)
N-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)-2-((1-methyl-1H-indol-3-yl)sulfonyl)acetamide
CAS 686743-53-3C19H18N2O5S
![(Z)-N-(4,7-Dimethoxy-3-methylbenzo[d]thiazol-2(3H)-ylidene)-2,3-dihydrobenzo[b][1,4]dioxine-2-carboxamide chemical structure, C19H18N2O5S, CAS 868370-83-6](/s/NADDGFDQMXLWOV-UHFFFAOYSA-N.svg)
(Z)-N-(4,7-Dimethoxy-3-methylbenzo[d]thiazol-2(3H)-ylidene)-2,3-dihydrobenzo[b][1,4]dioxine-2-carboxamide
CAS 868370-83-6C19H18N2O5S
![7-Methyl-4-oxo-N-[2-(4-sulfamoylphenyl)ethyl]-4H-chromene-2-carboxamide chemical structure, C19H18N2O5S, CAS 879468-78-7](/s/GALWRIKXWRMVDL-UHFFFAOYSA-N.svg)
7-Methyl-4-oxo-N-[2-(4-sulfamoylphenyl)ethyl]-4H-chromene-2-carboxamide
CAS 879468-78-7C19H18N2O5S
![(Z)-Methyl 2-(6-methoxy-2-((3-methoxybenzoyl)imino)benzo[d]thiazol-3(2H)-yl)acetate chemical structure, C19H18N2O5S, CAS 1164536-08-6](/s/KECGVHIMXBCEIC-UHFFFAOYSA-N.svg)
(Z)-Methyl 2-(6-methoxy-2-((3-methoxybenzoyl)imino)benzo[d]thiazol-3(2H)-yl)acetate
CAS 1164536-08-6C19H18N2O5S
![[2-Oxo-2-(3-oxo-2,4-dihydroquinoxalin-1-yl)ethyl] 2-methoxy-4-methylsulfanylbenzoate chemical structure, C19H18N2O5S, CAS 876551-51-8](/s/XJPCXUJXKGLHCK-UHFFFAOYSA-N.svg)
[2-Oxo-2-(3-oxo-2,4-dihydroquinoxalin-1-yl)ethyl] 2-methoxy-4-methylsulfanylbenzoate
CAS 876551-51-8C19H18N2O5S
![Methyl 2-[6-methoxy-2-(4-methoxybenzoyl)imino-1,3-benzothiazol-3-yl]acetate chemical structure, C19H18N2O5S, CAS 1164551-85-2](/s/SZBQCYVEZHOBMW-UHFFFAOYSA-N.svg)
Methyl 2-[6-methoxy-2-(4-methoxybenzoyl)imino-1,3-benzothiazol-3-yl]acetate
CAS 1164551-85-2C19H18N2O5S
![Methyl 4-{11-oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4(12),5,7-triene-6-sulfonamido}benzoate chemical structure, C19H18N2O5S, CAS 898436-26-5](/s/UFIHVOWWQOVLDK-UHFFFAOYSA-N.svg)
Methyl 4-{11-oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4(12),5,7-triene-6-sulfonamido}benzoate
CAS 898436-26-5C19H18N2O5S
![N-(Furan-2-ylmethyl)-4-[(2-methoxyphenyl)sulfamoyl]benzamide chemical structure, C19H18N2O5S, CAS 554437-47-7](/s/JOQFBWGJINRDQX-UHFFFAOYSA-N.svg)
N-(Furan-2-ylmethyl)-4-[(2-methoxyphenyl)sulfamoyl]benzamide
CAS 554437-47-7C19H18N2O5S
![N-{4-[(4-Ethoxyphenyl)sulfamoyl]phenyl}furan-2-carboxamide chemical structure, C19H18N2O5S, CAS 433305-93-2](/s/HUHIEPMPFOWGPN-UHFFFAOYSA-N.svg)
N-{4-[(4-Ethoxyphenyl)sulfamoyl]phenyl}furan-2-carboxamide
CAS 433305-93-2C19H18N2O5S
1-(2-Phenoxypropanoyl)-3-tosyl-1H-imidazol-2(3H)-one
CAS 950320-76-0C19H18N2O5S
![N-(1,1-Dioxidotetrahydrothiophen-3-yl)-3-(1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)propanamide chemical structure, C19H18N2O5S, CAS 496776-97-7](/s/IOCFPJDXIQELRD-UHFFFAOYSA-N.svg)
N-(1,1-Dioxidotetrahydrothiophen-3-yl)-3-(1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)propanamide
CAS 496776-97-7C19H18N2O5S
![3-((5-Ethoxybenzo[d]thiazol-2-yl)amino)-6,7-dimethoxyisobenzofuran-1(3H)-one chemical structure, C19H18N2O5S, CAS 337932-68-0](/s/ZLXSRFJDGMYNMS-UHFFFAOYSA-N.svg)
3-((5-Ethoxybenzo[d]thiazol-2-yl)amino)-6,7-dimethoxyisobenzofuran-1(3H)-one
CAS 337932-68-0C19H18N2O5S
![6-{[(3,4-Dimethylphenyl)(methyl)amino]sulfonyl}-4-oxo-1,4-dihydroquinoline-3-carboxylic acid chemical structure, C19H18N2O5S, CAS 434907-98-9](/s/PKVIXEPRALFLIS-UHFFFAOYSA-N.svg)
6-{[(3,4-Dimethylphenyl)(methyl)amino]sulfonyl}-4-oxo-1,4-dihydroquinoline-3-carboxylic acid
CAS 434907-98-9C19H18N2O5S
Carboxy pioglitazone (M-V)
CAS 146062-48-8C19H18N2O5S
![5-[(2-Methylphenoxy)methyl]-N-(4-sulfamoylphenyl)furan-2-carboxamide chemical structure, C19H18N2O5S, CAS 878716-15-5](/s/NXWWFCBMXCJBPT-UHFFFAOYSA-N.svg)
5-[(2-Methylphenoxy)methyl]-N-(4-sulfamoylphenyl)furan-2-carboxamide
CAS 878716-15-5C19H18N2O5S
Ethyl 2-(2-(1,3-dioxoisoindolin-2-yl)acetamido)-4,5-dimethylthiophene-3-carboxylate
CAS 60442-36-6C19H18N2O5S
N-(3-Acetylphenyl)-4-(2,5-dioxopyrrolidin-1-yl)-3-methylbenzenesulfonamide
CAS 946339-81-7C19H18N2O5S
3-(3-(Benzylsulfonyl)propanamido)benzofuran-2-carboxamide
CAS 922486-96-2C19H18N2O5S
- 4-(Benzylsulfonyl)-N-(1,3-dioxoisoindolin-5-yl)butanamide923457-59-4C19H18N2O5S
- N-(3-(1,1-Dioxidoisothiazolidin-2-yl)phenyl)-7-methoxybenzofuran-2-carboxamide1210897-09-8C19H18N2O5S
- (E)-Methyl 2-(2-cyano-3-(4-hydroxy-3-methoxyphenyl)acrylamido)-4,5-dimethylthiophene-3-carboxylate379731-02-9C19H18N2O5S
- Methyl 4-((5-((4-methoxyphenyl)amino)-2,4-dioxothiazolidin-3-yl)methyl)benzoate1008042-45-2C19H18N2O5S
- N-((3-(Benzo[d][1,3]dioxol-5-yl)-2-oxooxazolidin-5-yl)methyl)-2-(methylthio)benzamide955242-18-9C19H18N2O5S
- (E)-Methyl 2-(3-(3-nitrophenyl)acrylamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate314282-58-1C19H18N2O5S
- 2-[(4-Morpholin-4-ylsulfonylphenyl)methyl]isoindole-1,3-dione332412-99-4C19H18N2O5S
- 5-[(3-Methylphenoxy)methyl]-N-(4-sulfamoylphenyl)furan-2-carboxamide878716-17-7C19H18N2O5S
- Methyl 3-[(3,4-dimethoxyphenyl)methyl]-4-oxo-2-sulfanylidene-1,2,3,4-tetrahydroquinazoline-7-carboxylate1021219-89-5C19H18N2O5S
- N-[(2H-1,3-Benzodioxol-5-yl)methyl]-11-oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4(12),5,7-triene-6-sulfonamide898419-58-4C19H18N2O5S
- 2,4-Diethyl 5-(4-cyanobenzamido)-3-methylthiophene-2,4-dicarboxylate476293-67-1C19H18N2O5S
- Steroid sulfatase/17|A-HSD1-IN-12990549-70-5C19H18N2O5S
- 3,5-Dimethoxy-N-(3-methyl-6,7-dihydro-[1,4]dioxino[2,3-f][1,3]benzothiazol-2-ylidene)benzamide1322000-09-8C19H18N2O5S
- Cox-2-IN-132987588-45-2C19H18N2O5S
- 2-[(4-Methylphenoxy)methyl]-N-(4-sulfamoylphenyl)furan-3-carboxamide878716-13-3C19H18N2O5S
- N-(7-Methyl-6,7,8,9-tetrahydrodibenzofuran-2-yl)-3-nitrobenzenesulfonamide441292-56-4C19H18N2O5S
- Ethyl 3-methyl-1-(4-phenoxybenzenesulfonyl)-1H-pyrazole-5-carboxylate1177343-95-1C19H18N2O5S
- 2-Methylpropyl 4-methyl-2-{[(4-oxo-4H-chromen-2-yl)carbonyl]amino}-1,3-thiazole-5-carboxylate892640-67-4C19H18N2O5S
- (E)-Ethyl 2-methyl-5-(2-oxo-2-(2-(thiophen-2-ylmethylene)hydrazinyl)ethoxy)benzofuran-3-carboxylate383903-71-7C19H18N2O5S
- Dimethyl 5-({[(4-methylbenzoyl)amino]carbothioyl}amino)isophthalate333414-98-5C19H18N2O5S
- 6-{[(4-Ethylphenyl)(methyl)amino]sulfonyl}-4-oxo-1,4-dihydroquinoline-3-carboxylic acid434907-95-6C19H18N2O5S
- N-(2H-1,3-Benzodioxol-5-yl)-2-oxo-1-azatricyclo[7.3.1.0^{5,13}]trideca-5,7,9(13)-triene-7-sulfonamide903364-08-9C19H18N2O5S
- (2E,5E)-2-((4-Hydroxyphenyl)imino)-5-(2,3,4-trimethoxybenzylidene)thiazolidin-4-one476668-30-1C19H18N2O5S
- Benzoxazolium, 2-(2-(acetylphenylamino)ethenyl)-3-ethyl-5-sulfo-, inner salt68083-28-3C19H18N2O5S
- Methyl 2-[(5E)-5-[[1-(4-methoxyphenyl)pyrrol-2-yl]methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]propanoate1084609-35-7C19H18N2O5S
- 3-(4-(Phenylsulfonyl)butanamido)benzofuran-2-carboxamide941966-89-8C19H18N2O5S
- 1-(Methylsulfonyl)-N~6~-(1-oxo-1,3-dihydro-5-isobenzofuranyl)-1,2,3,4-tetrahydro-6-quinolinecarboxamide1020241-89-7C19H18N2O5S
- 3-(2-Methyl-1,3-thiazol-4-yl)-7-[2-(morpholin-4-yl)-2-oxoethoxy]-2H-chromen-2-one1081121-78-9C19H18N2O5S
- 3,4-Dimethoxy-N-(3-methyl-6,7-dihydro-[1,4]dioxino[2,3-f][1,3]benzothiazol-2-ylidene)benzamide1322249-47-7C19H18N2O5S
- (Z)-N-(5,6-Dimethoxy-3-methylbenzo[d]thiazol-2(3H)-ylidene)-2,3-dihydrobenzo[b][1,4]dioxine-6-carboxamide895433-08-6C19H18N2O5S
- 1-(4-Ethoxybenzoyl)-3-(4-methylphenyl)sulfonylimidazol-2-one950320-61-3C19H18N2O5S
- N-(1,3-Dioxo-2,3-dihydro-1H-isoindol-5-yl)-4-(4-methylbenzenesulfonyl)butanamide923088-84-0C19H18N2O5S
- (Z)-N-(5,6-Dimethoxy-3-methylbenzo[d]thiazol-2(3H)-ylidene)-2,3-dihydrobenzo[b][1,4]dioxine-2-carboxamide895444-05-0C19H18N2O5S
- 6-(((1-Methyl-1H-imidazol-2-yl)thio)methyl)-4-oxo-4H-pyran-3-yl 2-ethoxybenzoate896307-63-4C19H18N2O5S
- 6-(((1-Methyl-1H-imidazol-2-yl)thio)methyl)-4-oxo-4H-pyran-3-yl 4-ethoxybenzoate896307-70-3C19H18N2O5S
- 2H-1-Benzopyran-8-sulfonamide, 4,5,7-trimethyl-2-oxo-N-((phenylamino)carbonyl)-85302-26-7C19H18N2O5S
- Ethyl 5-(4-(2,5-dioxopyrrolidin-1-yl)benzamido)-3-methylthiophene-2-carboxylate477567-89-8C19H18N2O5S
- 6-Methyl-4-oxo-N-[2-(4-sulfamoylphenyl)ethyl]-4H-chromene-2-carboxamide881217-60-3C19H18N2O5S
- (5Z)-1-(1,1-Dioxidotetrahydrothiophen-3-yl)-5-(4-methoxybenzylidene)-4-methyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile877802-75-0C19H18N2O5S
- Methyl 2-{[(2E)-2-cyano-3-(2,4-dimethoxyphenyl)prop-2-enoyl]amino}-5-methylthiophene-3-carboxylate587852-69-5C19H18N2O5S
- 3-[(5Z)-5-(Furan-2-ylmethylidene)-2,4-dioxo-1,3-thiazolidin-3-yl]-N-[2-(4-hydroxyphenyl)ethyl]propanamide902304-48-7C19H18N2O5S
- N-{11-Oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4(12),5,7-trien-6-yl}-2,3-dihydro-1,4-benzodioxine-6-sulfonamide903274-33-9C19H18N2O5S
- N-(2,3-Dihydro-1,4-benzodioxin-6-yl)-11-oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4(12),5,7-triene-6-sulfonamide898436-06-1C19H18N2O5S
- 4-[(9,10-Dioxoanthracen-2-yl)sulfonyl-methylamino]butanamide941924-56-7C19H18N2O5S
- 3-(3-(Isopropylsulfonyl)benzamido)benzofuran-2-carboxamide900009-64-5C19H18N2O5S
- 3-(Benzylsulfonyl)-N-(2-methyl-1,3-dioxoisoindolin-4-yl)propanamide923447-93-2C19H18N2O5S
- N-(6,7-Dihydro-[1,4]dioxino[2',3':4,5]benzo[1,2-d]thiazol-2-yl)-2-(3,4-dimethoxyphenyl)acetamide953995-50-1C19H18N2O5S
- Methyl 2-({(2E)-2-cyano-3-[4-methoxy-3-(methoxymethyl)phenyl]prop-2-enoyl}amino)thiophene-3-carboxylate890545-39-8C19H18N2O5S
- 4-(Isopropylsulfonyl)-N-(2-methyl-1,3-dioxoisoindolin-5-yl)benzamide919754-66-8C19H18N2O5S
- 3-(4-(Isopropylsulfonyl)benzamido)benzofuran-2-carboxamide941957-09-1C19H18N2O5S
- Parecoxib impurity 67198471-83-9C19H18N2O5S
- 3-(Isopropylsulfonyl)-N-(2-methyl-1,3-dioxoisoindolin-4-yl)benzamide919843-57-5C19H18N2O5S
- 1-(Benzo[d]isoxazol-3-yl)-N-(2-(benzofuran-2-yl)-2-hydroxypropyl)methanesulfonamide2034270-57-8C19H18N2O5S
- (Z)-Methyl 4-((4,7-dimethoxy-3-methylbenzo[d]thiazol-2(3H)-ylidene)carbamoyl)benzoate868370-00-7C19H18N2O5S
- Methyl 2-[6-methoxy-2-(2-methoxybenzoyl)imino-1,3-benzothiazol-3-yl]acetate865200-10-8C19H18N2O5S
- (Z)-N-(4,7-Dimethoxy-3-methylbenzo[d]thiazol-2(3H)-ylidene)-2,3-dihydrobenzo[b][1,4]dioxine-6-carboxamide896676-56-5C19H18N2O5S
- Ethyl 2-(3,5-dimethoxybenzamido)benzo[d]thiazole-6-carboxylate946309-70-2C19H18N2O5S
- Methyl 2-[6-methoxy-2-(2-phenoxyacetyl)imino-1,3-benzothiazol-3-yl]acetate865200-17-5C19H18N2O5S
- Ethyl 2-(3,4-dimethoxybenzamido)benzo[d]thiazole-6-carboxylate896680-11-8C19H18N2O5S
- 4-Methyl-3-nitro-N-(6,7,8,9-tetrahydrodibenzofuran-2-yl)benzenesulfonamide518331-22-1C19H18N2O5S
- N-{2-Oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4,6,8(12)-trien-6-yl}-2,3-dihydro-1,4-benzodioxine-6-sulfonamide898411-10-4C19H18N2O5S
- Methyl 2-[4-(2,5-dioxopyrrolidin-1-yl)benzamido]-4,5-dimethylthiophene-3-carboxylate896615-50-2C19H18N2O5S
- Ethyl 3-(4-methyl-2-oxo-1,2-dihydroquinoline-6-sulfonamido)benzoate899998-44-8C19H18N2O5S
- Ethyl 4-(4-methyl-2-oxo-1,2-dihydroquinoline-6-sulfonamido)benzoate899998-46-0C19H18N2O5S
- 3-(2-(4-(Ethylsulfonyl)phenyl)acetamido)benzofuran-2-carboxamide941992-57-0C19H18N2O5S
- 2-(4-(Ethylsulfonyl)phenyl)-N-(2-methyl-1,3-dioxoisoindolin-4-yl)acetamide919758-53-5C19H18N2O5S
- 1-Amino-4-(cyclopentylamino)-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid860207-53-0C19H18N2O5S
- N-(Furan-2-ylmethyl)-N-(pyridin-2-ylmethyl)-2,3-dihydrobenzo[b][1,4]dioxine-6-sulfonamide1286726-84-8C19H18N2O5S
- 2-{[4-(3-Acetylbenzenesulfonamido)but-2-YN-1-yl]oxy}benzamide1448057-92-8C19H18N2O5S
- 3-(2-Oxo-2-(3-(phenylsulfonyl)pyrrolidin-1-yl)ethyl)benzo[d]oxazol-2(3H)-one1448054-90-7C19H18N2O5S
- N1-((5-(furan-2-yl(hydroxy)methyl)thiophen-2-yl)methyl)-N2-(2-methoxyphenyl)oxalamide1788771-24-3C19H18N2O5S
- (E)-N-(2-(2,4-Dioxooxazolidin-3-yl)-1-phenylethyl)-2-phenylethenesulfonamide2035000-44-1C19H18N2O5S
- N1-(2-(furan-2-yl)-2-hydroxy-2-(thiophen-2-yl)ethyl)-N2-(2-methoxyphenyl)oxalamide1903473-78-8C19H18N2O5S
- N1-(2-(furan-2-yl)-2-hydroxy-2-(thiophen-3-yl)ethyl)-N2-(2-methoxyphenyl)oxalamide2034262-22-9C19H18N2O5S
- N1-(2-(furan-3-yl)-2-hydroxy-2-(thiophen-2-yl)ethyl)-N2-(2-methoxyphenyl)oxalamide2034265-49-9C19H18N2O5S
- N1-(2-hydroxy-2-(5-(thiophen-3-yl)furan-2-yl)ethyl)-N2-(2-methoxyphenyl)oxalamide2034253-00-2C19H18N2O5S
Frequently asked questions
What is the molar mass of C19H18N2O5S?
The molar mass of C19H18N2O5S is 386.42 g/mol, calculated from standard atomic weights for 19 carbon atoms, 18 hydrogen atoms, 2 nitrogen atoms, 5 oxygen atoms and 1 sulfur atom. The monoisotopic mass is 386.0936 Da.
How many compounds have the formula C19H18N2O5S?
CompoundList lists 128 compounds with the molecular formula C19H18N2O5S, including Zinquin, N-(2-Furylmethyl)-4-{[(3-methoxyphenyl)sulfonyl]amino}benzamide, Ethyl 4-[4-(furan-2-carbonyloxy)phenyl]-6-methyl-2-sulfanylidene-3,4-dihydro-1H-pyrimidine-5-carboxylate. 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 C19H18N2O5S?
C19H18N2O5S 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.