Molecular formula
C20H18N2O6S
81 compounds have this formula on CompoundList.
- Molar mass
- 414.43g/mol
- Monoisotopic mass
- 414.0886Da
- Atoms
- 47
- Elements
- 5
- Rings plus double bonds
- 13
The formula C20H18N2O6S describes a molecule made of 20 carbon atoms, 18 hydrogen atoms, 2 nitrogen atoms, 6 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 × 2057.96%12.011 × 20 = 240.220 g/mol
- H Hydrogen × 184.38%1.008 × 18 = 18.144 g/mol
- N Nitrogen × 26.76%14.007 × 2 = 28.014 g/mol
- O Oxygen × 623.16%15.999 × 6 = 95.994 g/mol
- S Sulfur × 17.74%32.06 × 1 = 32.060 g/mol
Look up another formula
Compounds with the formula C20H18N2O6S
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 81 of 81 compounds
![2-[(5Z)-5-(3,4-Dimethoxybenzylidene)-2,4-dioxo-1,3-thiazolidin-3-yl]-N-(2-hydroxyphenyl)acetamide chemical structure, C20H18N2O6S, CAS 429643-99-2](/s/YPMRRCXXBQIQTK-YVLHZVERSA-N.svg)
2-[(5Z)-5-(3,4-Dimethoxybenzylidene)-2,4-dioxo-1,3-thiazolidin-3-yl]-N-(2-hydroxyphenyl)acetamide
CAS 429643-99-2C20H18N2O6S
2-(2,3-Dihydro-1,4-benzodioxin-6-ylsulfonylamino)-N-(furan-2-ylmethyl)benzamide
CAS 694504-66-0C20H18N2O6S
![2-[1-(1,3-Benzodioxol-5-yl)-2,5-dioxopyrrolidin-3-yl]sulfanyl-N-(2-methoxyphenyl)acetamide chemical structure, C20H18N2O6S, CAS 717895-30-2](/s/QVDLGVRGIVANBP-UHFFFAOYSA-N.svg)
2-[1-(1,3-Benzodioxol-5-yl)-2,5-dioxopyrrolidin-3-yl]sulfanyl-N-(2-methoxyphenyl)acetamide
CAS 717895-30-2C20H18N2O6S
![3,4,5-Trimethoxy-N-[(2-oxochromen-6-yl)carbamothioyl]benzamide chemical structure, C20H18N2O6S, CAS 835887-04-2](/s/IHPWNRDLNVIRCW-UHFFFAOYSA-N.svg)
3,4,5-Trimethoxy-N-[(2-oxochromen-6-yl)carbamothioyl]benzamide
CAS 835887-04-2C20H18N2O6S
![3-[(5-{[4-(Ethoxycarbonyl)phenyl]amino}-2,4-dioxo-1,3-thiazolidin-3-yl)methyl]benzoic acid chemical structure, C20H18N2O6S, CAS 1009241-80-8](/s/QNHAAQLRLRPPBH-UHFFFAOYSA-N.svg)
3-[(5-{[4-(Ethoxycarbonyl)phenyl]amino}-2,4-dioxo-1,3-thiazolidin-3-yl)methyl]benzoic acid
CAS 1009241-80-8C20H18N2O6S
![2-[4-[(Z)-[2-(4-Hydroxy-N-methylanilino)-4-oxo-1,3-thiazol-5-ylidene]methyl]-2-methoxyphenoxy]acetic acid chemical structure, C20H18N2O6S, CAS 501347-80-4](/s/CRLDQDHNCBSYMG-YVLHZVERSA-N.svg)
2-[4-[(Z)-[2-(4-Hydroxy-N-methylanilino)-4-oxo-1,3-thiazol-5-ylidene]methyl]-2-methoxyphenoxy]acetic acid
CAS 501347-80-4C20H18N2O6S
![N-(4-(Benzo[d][1,3]dioxol-5-yl)thiazol-2-yl)-3,4,5-trimethoxybenzamide chemical structure, C20H18N2O6S, CAS 361479-58-5](/s/NTUHYGGDMFEWLZ-UHFFFAOYSA-N.svg)
N-(4-(Benzo[d][1,3]dioxol-5-yl)thiazol-2-yl)-3,4,5-trimethoxybenzamide
CAS 361479-58-5C20H18N2O6S
![[6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 2,3-dimethoxybenzoate chemical structure, C20H18N2O6S, CAS 877635-80-8](/s/ZERBIBNERKLEPZ-UHFFFAOYSA-N.svg)
[6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 2,3-dimethoxybenzoate
CAS 877635-80-8C20H18N2O6S
![N-((5-(Benzo[d][1,3]dioxol-5-yl)isoxazol-3-yl)methyl)-3-(phenylsulfonyl)propanamide chemical structure, C20H18N2O6S, CAS 1207048-16-5](/s/NHLGIPVJVQRVSK-UHFFFAOYSA-N.svg)
N-((5-(Benzo[d][1,3]dioxol-5-yl)isoxazol-3-yl)methyl)-3-(phenylsulfonyl)propanamide
CAS 1207048-16-5C20H18N2O6S
![Diethyl 5-[2-(1,3-dioxoinden-2-ylidene)hydrazinyl]-3-methylthiophene-2,4-dicarboxylate chemical structure, C20H18N2O6S, CAS 300829-53-2](/s/RJWHZLNEUGATBY-UHFFFAOYSA-N.svg)
Diethyl 5-[2-(1,3-dioxoinden-2-ylidene)hydrazinyl]-3-methylthiophene-2,4-dicarboxylate
CAS 300829-53-2C20H18N2O6S
![(Z)-Methyl 3-(2-methoxy-2-oxoethyl)-2-((2-phenoxyacetyl)imino)-2,3-dihydrobenzo[d]thiazole-6-carboxylate chemical structure, C20H18N2O6S, CAS 865197-57-5](/s/JNUQCANIGZROFP-UHFFFAOYSA-N.svg)
(Z)-Methyl 3-(2-methoxy-2-oxoethyl)-2-((2-phenoxyacetyl)imino)-2,3-dihydrobenzo[d]thiazole-6-carboxylate
CAS 865197-57-5C20H18N2O6S
![3,4,5-Trihydroxy-N-[4-[(4-methylphenyl)sulfonylamino]phenyl]benzamide chemical structure, C20H18N2O6S, CAS 2489813-11-6](/s/JEZNIHXKGRBFON-UHFFFAOYSA-N.svg)
3,4,5-Trihydroxy-N-[4-[(4-methylphenyl)sulfonylamino]phenyl]benzamide
CAS 2489813-11-6C20H18N2O6S
(Z)-2-(2-Methoxy-4-((1-(4-methoxyphenyl)-5-oxo-2-thioxoimidazolidin-4-ylidene)methyl)phenoxy)acetic acid
CAS 2411852-67-8C20H18N2O6S
![(Z)-Methyl 2-(2-((2,3-dihydrobenzo[b][1,4]dioxine-2-carbonyl)imino)-4-methoxybenzo[d]thiazol-3(2H)-yl)acetate chemical structure, C20H18N2O6S, CAS 1321710-19-3](/s/UHNNXCVTKXQIDI-UHFFFAOYSA-N.svg)
(Z)-Methyl 2-(2-((2,3-dihydrobenzo[b][1,4]dioxine-2-carbonyl)imino)-4-methoxybenzo[d]thiazol-3(2H)-yl)acetate
CAS 1321710-19-3C20H18N2O6S
![Dimethyl 5-{[(3-oxo-3,4-dihydro-2H-1,4-benzothiazin-2-yl)acetyl]amino}isophthalate chemical structure, C20H18N2O6S, CAS 633287-31-7](/s/CAQZNWWQKPNNST-UHFFFAOYSA-N.svg)
Dimethyl 5-{[(3-oxo-3,4-dihydro-2H-1,4-benzothiazin-2-yl)acetyl]amino}isophthalate
CAS 633287-31-7C20H18N2O6S
2-((3-(4-(Ethoxycarbonyl)benzyl)-2,4-dioxothiazolidin-5-yl)amino)benzoic acid
CAS 1009350-50-8C20H18N2O6S
![3-({3-[4-(Ethoxycarbonyl)benzyl]-2,4-dioxo-1,3-thiazolidin-5-yl}amino)benzoic acid chemical structure, C20H18N2O6S, CAS 1008043-12-6](/s/RGTMKFONKNOYBC-UHFFFAOYSA-N.svg)
3-({3-[4-(Ethoxycarbonyl)benzyl]-2,4-dioxo-1,3-thiazolidin-5-yl}amino)benzoic acid
CAS 1008043-12-6C20H18N2O6S
![Methyl 2-(furan-2-carbonylamino)-5-[(2-methoxyphenyl)carbamoyl]-4-methylthiophene-3-carboxylate chemical structure, C20H18N2O6S, CAS 333308-34-2](/s/VXJOFTNHKYXHIN-UHFFFAOYSA-N.svg)
Methyl 2-(furan-2-carbonylamino)-5-[(2-methoxyphenyl)carbamoyl]-4-methylthiophene-3-carboxylate
CAS 333308-34-2C20H18N2O6S
![Ethyl 6-[(4-formylbenzoyl)oxymethyl]-2-oxo-4-thiophen-2-yl-3,4-dihydro-1H-pyrimidine-5-carboxylate chemical structure, C20H18N2O6S, CAS 5474-47-5](/s/HTHFFKTZEGYXSY-UHFFFAOYSA-N.svg)
Ethyl 6-[(4-formylbenzoyl)oxymethyl]-2-oxo-4-thiophen-2-yl-3,4-dihydro-1H-pyrimidine-5-carboxylate
CAS 5474-47-5C20H18N2O6S
![N-(4-((Benzo[D]1,3-dioxolen-5-YL(2-furylmethyl)amino)sulfonyl)phenyl)ethanamide chemical structure, C20H18N2O6S, CAS 1119392-26-5](/s/SLVHYTGMFSAFGG-UHFFFAOYSA-N.svg)
N-(4-((Benzo[D]1,3-dioxolen-5-YL(2-furylmethyl)amino)sulfonyl)phenyl)ethanamide
CAS 1119392-26-5C20H18N2O6S
![Methyl 2-(2-furoylamino)-5-[(4-methoxyanilino)carbonyl]-4-methylthiophene-3-carboxylate chemical structure, C20H18N2O6S, CAS 445003-62-3](/s/MWFSOWFUCOKVEV-UHFFFAOYSA-N.svg)
Methyl 2-(2-furoylamino)-5-[(4-methoxyanilino)carbonyl]-4-methylthiophene-3-carboxylate
CAS 445003-62-3C20H18N2O6S
![[4-Oxo-6-(pyrimidin-2-ylsulfanylmethyl)pyran-3-yl] 2-(4-ethoxyphenoxy)acetate chemical structure, C20H18N2O6S, CAS 877637-16-6](/s/AMTDEODAXVSNOL-UHFFFAOYSA-N.svg)
[4-Oxo-6-(pyrimidin-2-ylsulfanylmethyl)pyran-3-yl] 2-(4-ethoxyphenoxy)acetate
CAS 877637-16-6C20H18N2O6S
![N-(1,3-Benzodioxol-5-yl)-4-[furan-2-ylmethyl(methyl)sulfamoyl]benzamide chemical structure, C20H18N2O6S, CAS 899735-29-6](/s/LLVXSQXIJKCHDQ-UHFFFAOYSA-N.svg)
N-(1,3-Benzodioxol-5-yl)-4-[furan-2-ylmethyl(methyl)sulfamoyl]benzamide
CAS 899735-29-6C20H18N2O6S
5-(Benzyloxy)-4-oxo-N-(4-sulfamoylbenzyl)-4H-pyran-2-carboxamide
CAS 1021093-46-8C20H18N2O6S
- Methyl 5-acetyl-2-[3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)propanamido]-4-methylthiophene-3-carboxylate611193-25-0C20H18N2O6S
- N-[4-(Morpholin-4-ylsulfonyl)phenyl]-4-oxo-4H-chromene-2-carboxamide736164-07-1C20H18N2O6S
- N-(3-Morpholin-4-ylsulfonylphenyl)-2-oxochromene-3-carboxamide791086-18-5C20H18N2O6S
- [6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 3,4-dimethoxybenzoate877635-74-0C20H18N2O6S
- [6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 3,5-dimethoxybenzoate877635-86-4C20H18N2O6S
- [6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 2-(2-methoxyphenoxy)acetate877637-10-0C20H18N2O6S
- [6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 2-(3-methoxyphenoxy)acetate877637-12-2C20H18N2O6S
- [6-[(4-Methylpyrimidin-2-yl)sulfanylmethyl]-4-oxopyran-3-yl] 2-(4-methoxyphenoxy)acetate877637-14-4C20H18N2O6S
- (Z)-Methyl 2-(2-((2-phenoxyacetyl)imino)-6,7-dihydro-[1,4]dioxino[2',3':4,5]benzo[1,2-d]thiazol-3(2H)-yl)acetate895448-58-5C20H18N2O6S
- N-(2-(Furan-2-yl)-2-tosylethyl)-3-nitrobenzamide896322-19-3C20H18N2O6S
- 1'-((3-Methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)sulfonyl)-3H-spiro[isobenzofuran-1,4'-piperidin]-3-one1797022-62-8C20H18N2O6S
- 2-(4-((4-Hydroxybiphenyl-3-yl)azo)phenoxy)ethyl hydrogen sulphate73301-95-8C20H18N2O6S
- (5E)-3-Ethyl-5-{3-methoxy-4-[(4-nitrobenzyl)oxy]benzylidene}-1,3-thiazolidine-2,4-dione593274-10-3C20H18N2O6S
- 4-(2H-1,3-Benzodioxol-5-yl)-2-(morpholine-4-carbonyl)-4H-1lambda6,4-benzothiazine-1,1-dione1251693-07-8C20H18N2O6S
- (Z)-Methyl 2-(2-((2,3-dihydrobenzo[b][1,4]dioxine-6-carbonyl)imino)-6-methoxybenzo[d]thiazol-3(2H)-yl)acetate865200-03-9C20H18N2O6S
- (Z)-Methyl 2-(2-((2,3-dihydrobenzo[b][1,4]dioxine-2-carbonyl)imino)-6-methoxybenzo[d]thiazol-3(2H)-yl)acetate865200-12-0C20H18N2O6S
- (Z)-Methyl 3-(2-methoxy-2-oxoethyl)-2-((4-methoxybenzoyl)imino)-2,3-dihydrobenzo[d]thiazole-6-carboxylate865197-48-4C20H18N2O6S
- (Z)-Methyl 4-((6-methoxy-3-(2-methoxy-2-oxoethyl)benzo[d]thiazol-2(3H)-ylidene)carbamoyl)benzoate865199-99-1C20H18N2O6S
- Ethyl 4-(benzenesulfonyloxy)-1-(4-methylphenyl)-6-oxopyridazine-3-carboxylate886950-54-5C20H18N2O6S
- Ethyl 4-(3-methylphenyl)sulfonyloxy-6-oxo-1-phenylpyridazine-3-carboxylate886950-59-0C20H18N2O6S
- Ethyl 4-(4-methylphenyl)sulfonyloxy-6-oxo-1-phenylpyridazine-3-carboxylate886950-74-9C20H18N2O6S
- (1,3-Dioxoisoindol-2-yl)methyl 2-[[(E)-2-(4-methylphenyl)ethenyl]sulfonylamino]acetate874625-65-7C20H18N2O6S
- Ethyl 6-oxo-4-((phenylsulfonyl)oxy)-1-(o-tolyl)-1,6-dihydropyridazine-3-carboxylate886950-49-8C20H18N2O6S
- Methyl 2-[(5Z)-5-[(2-methoxybenzoyl)imino]-10,13-dioxa-4-thia-6-azatricyclo[7.4.0.0^{3,7}]trideca-1,3(7),8-trien-6-yl]acetate895445-22-4C20H18N2O6S
- N1-(benzo[d][1,3]dioxol-5-ylmethyl)-N2-((5-(furan-2-yl(hydroxy)methyl)thiophen-2-yl)methyl)oxalamide1790198-00-3C20H18N2O6S
- Methyl 4-(2-(((5-(furan-2-yl(hydroxy)methyl)thiophen-2-yl)methyl)amino)-2-oxoacetamido)benzoate1795442-28-2C20H18N2O6S
- N1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-N2-(2-(furan-2-yl)-2-hydroxy-2-(thiophen-2-yl)ethyl)oxalamide1903592-36-8C20H18N2O6S
- N-(2-(Furan-2-yl)-2-(furan-3-yl)-2-hydroxyethyl)-4-(2-methyloxazol-4-yl)benzenesulfonamide2034621-99-1C20H18N2O6S
- Methyl 4-(2-((2-(furan-2-yl)-2-hydroxy-2-(thiophen-3-yl)ethyl)amino)-2-oxoacetamido)benzoate2034633-14-0C20H18N2O6S
- N1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-N2-(2-hydroxy-2-(5-(thiophen-3-yl)furan-2-yl)ethyl)oxalamide2034491-59-1C20H18N2O6S
- N1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-N2-(2-(furan-3-yl)-2-hydroxy-2-(thiophen-2-yl)ethyl)oxalamide2034240-52-1C20H18N2O6S
- N1-(benzo[d][1,3]dioxol-5-ylmethyl)-N2-(2-hydroxy-2-(5-(thiophen-3-yl)furan-2-yl)ethyl)oxalamide2034253-48-8C20H18N2O6S
- N-{2-[4-(Furan-2-yl)phenyl]-2-hydroxyethyl}-3-methyl-2-oxo-2,3-dihydro-1,3-benzoxazole-5-sulfonamide2097860-19-8C20H18N2O6S
- N-(2,2-Di(furan-2-yl)ethyl)-4-(2,5-dioxopyrrolidin-1-yl)benzenesulfonamide2320900-27-2C20H18N2O6S
- Methyl [(5E)-5-{[1-(1,3-benzodioxol-5-yl)-2,5-dimethyl-1H-pyrrol-3-yl]methylidene}-2,4-dioxo-1,3-thiazolidin-3-yl]acetate677754-05-1C20H18N2O6S
- 2-(1,3-Dioxoisoindol-2-yl)ethyl 2-[[(E)-2-phenylethenyl]sulfonylamino]acetate735320-18-0C20H18N2O6S
- N'-(2,3-Dihydro-1,4-benzodioxin-6-yl)-N-[2-(furan-2-yl)-2-hydroxy-2-(thiophen-3-yl)ethyl]ethanediamide2097929-28-5C20H18N2O6S
- N-[(2H-1,3-Benzodioxol-5-yl)methyl]-4-{[(furan-2-yl)methyl]sulfamoyl}benzamide610281-99-7C20H18N2O6S
- 1-(2-Thienylcarbonyl)-L-proline 2-(3,4-dihydro-3-oxo-2H-1,4-benzoxazin-6-yl)-2-oxoethyl ester385370-83-2C20H18N2O6S
- 3-[1-(4-Cyano-benzenesulfonyl)-5,6-dimethoxy-1H-indol-3-yl]-propionic acid929255-48-1C20H18N2O6S
- N'-(2,3-Dihydro-1,4-benzodioxin-6-yl)-N-{2-[4-(furan-2-yl)thiophen-2-yl]-2-hydroxyethyl}ethanediamide2309192-38-7C20H18N2O6S
- N'-[(2H-1,3-Benzodioxol-5-yl)methyl]-N-{2-[4-(furan-2-yl)thiophen-2-yl]-2-hydroxyethyl}ethanediamide2320889-76-5C20H18N2O6S
- N'-(2,3-Dihydro-1,4-benzodioxin-6-yl)-N-{2-hydroxy-2-[5-(thiophen-2-yl)furan-2-yl]ethyl}ethanediamide2320533-58-0C20H18N2O6S
- N'-[(2H-1,3-Benzodioxol-5-yl)methyl]-N-{2-hydroxy-2-[5-(thiophen-2-yl)furan-2-yl]ethyl}ethanediamide2309186-24-9C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 1-(benzenesulfonyl)piperidine-2-carboxylate2248257-48-7C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 2-(piperidine-1-sulfonyl)benzoate2248342-74-5C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-(piperidine-1-sulfonyl)benzoate2248282-71-3C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-[4-(1,1-dioxo-1lambda6,2-thiazolidin-2-yl)phenyl]propanoate2248409-53-0C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl (2S)-1-(4-methylbenzenesulfonyl)pyrrolidine-2-carboxylate2248201-28-5C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-(cyclopentylsulfamoyl)benzoate2248279-90-3C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-[(1,1-dioxo-1lambda6-thiomorpholin-4-yl)methyl]benzoate2248364-39-6C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 3-[4-(cyclopropylsulfamoyl)phenyl]propanoate2248403-00-9C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 2-({[(2-methoxyethyl)carbamoyl]methyl}sulfanyl)benzoate2248388-78-3C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 1-(benzenesulfonyl)piperidine-4-carboxylate2248390-25-0C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 2-methyl-5-(pyrrolidine-1-sulfonyl)benzoate2248283-92-1C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 4-(piperidine-1-sulfonyl)benzoate2248292-71-7C20H18N2O6S
- 1,3-Dioxo-2,3-dihydro-1H-isoindol-2-yl 1-(benzenesulfonyl)piperidine-3-carboxylate2248400-87-3C20H18N2O6S
Frequently asked questions
What is the molar mass of C20H18N2O6S?
The molar mass of C20H18N2O6S is 414.43 g/mol, calculated from standard atomic weights for 20 carbon atoms, 18 hydrogen atoms, 2 nitrogen atoms, 6 oxygen atoms and 1 sulfur atom. The monoisotopic mass is 414.0886 Da.
How many compounds have the formula C20H18N2O6S?
CompoundList lists 81 compounds with the molecular formula C20H18N2O6S, including 2-[(5Z)-5-(3,4-Dimethoxybenzylidene)-2,4-dioxo-1,3-thiazolidin-3-yl]-N-(2-hydroxyphenyl)acetamide, 2-(2,3-Dihydro-1,4-benzodioxin-6-ylsulfonylamino)-N-(furan-2-ylmethyl)benzamide, 2-[1-(1,3-Benzodioxol-5-yl)-2,5-dioxopyrrolidin-3-yl]sulfanyl-N-(2-methoxyphenyl)acetamide. 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 C20H18N2O6S?
C20H18N2O6S has a degree of unsaturation of 13. 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.