Molecular formula
C20H20N2O3S2
108 compounds have this formula on CompoundList.
- Molar mass
- 400.51g/mol
- Monoisotopic mass
- 400.0915Da
- Atoms
- 47
- Elements
- 5
- Rings plus double bonds
- 12
The formula C20H20N2O3S2 describes a molecule made of 20 carbon atoms, 20 hydrogen atoms, 2 nitrogen atoms, 3 oxygen atoms and 2 sulfur 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 × 2059.98%12.011 × 20 = 240.220 g/mol
- H Hydrogen × 205.03%1.008 × 20 = 20.160 g/mol
- N Nitrogen × 26.99%14.007 × 2 = 28.014 g/mol
- O Oxygen × 311.98%15.999 × 3 = 47.997 g/mol
- S Sulfur × 216.01%32.06 × 2 = 64.120 g/mol
Look up another formula
Compounds with the formula C20H20N2O3S2
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 108 compounds
![N-[4-[(2,4,6-Trimethylphenyl)sulfamoyl]phenyl]thiophene-2-carboxamide chemical structure, C20H20N2O3S2, CAS 431938-76-0](/s/RQTQDKBPEQFMOJ-UHFFFAOYSA-N.svg)
N-[4-[(2,4,6-Trimethylphenyl)sulfamoyl]phenyl]thiophene-2-carboxamide
CAS 431938-76-0C20H20N2O3S2
![Ethyl [(4-oxo-3-phenyl-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl)sulfanyl]acetate chemical structure, C20H20N2O3S2, CAS 59898-81-6](/s/YBUVCMGKGINWPF-UHFFFAOYSA-N.svg)
Ethyl [(4-oxo-3-phenyl-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl)sulfanyl]acetate
CAS 59898-81-6C20H20N2O3S2
![Ethyl 2-(2-((1H-indol-3-yl)thio)acetamido)-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate chemical structure, C20H20N2O3S2, CAS 450352-15-5](/s/VDWRTTIMCCNXSI-UHFFFAOYSA-N.svg)
Ethyl 2-(2-((1H-indol-3-yl)thio)acetamido)-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate
CAS 450352-15-5C20H20N2O3S2
(E)-N-Benzyl-N-ethyl-3-(5-(furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)propanamide
CAS 682784-39-0C20H20N2O3S2
![N-[(2E)-5,5-Dioxido-3-phenyltetrahydrothieno[3,4-d][1,3]thiazol-2(3H)-ylidene]-3-phenylpropanamide chemical structure, C20H20N2O3S2, CAS 900869-77-4](/s/AYLLUUFINLPSDM-UHFFFAOYSA-N.svg)
N-[(2E)-5,5-Dioxido-3-phenyltetrahydrothieno[3,4-d][1,3]thiazol-2(3H)-ylidene]-3-phenylpropanamide
CAS 900869-77-4C20H20N2O3S2
![3-Allyl-6-ethyl-2-((2-(4-methoxyphenyl)-2-oxoethyl)thio)thieno[2,3-d]pyrimidin-4(3H)-one chemical structure, C20H20N2O3S2, CAS 421577-91-5](/s/KJEBGDKQNQTFMI-UHFFFAOYSA-N.svg)
3-Allyl-6-ethyl-2-((2-(4-methoxyphenyl)-2-oxoethyl)thio)thieno[2,3-d]pyrimidin-4(3H)-one
CAS 421577-91-5C20H20N2O3S2
N-(4-(2,4-Dimethoxyphenyl)thiazol-2-yl)-2-(ethylthio)benzamide
CAS 922641-98-3C20H20N2O3S2
N-(4-(3,4-Dimethoxyphenyl)thiazol-2-yl)-2-(4-(methylthio)phenyl)acetamide
CAS 941930-12-7C20H20N2O3S2
![(E)-Methyl 2-(2-(cinnamylthio)-5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-3(4H)-yl)acetate chemical structure, C20H20N2O3S2, CAS 369392-54-1](/s/DWXIWMLIRXLTQS-JXMROGBWSA-N.svg)
(E)-Methyl 2-(2-(cinnamylthio)-5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-3(4H)-yl)acetate
CAS 369392-54-1C20H20N2O3S2
![5-Benzyl-4-methyl-2-[(4-methylphenyl)sulfonylamino]thiophene-3-carboxamide chemical structure, C20H20N2O3S2, CAS 304667-91-2](/s/MKXIWMVKCFSCIT-UHFFFAOYSA-N.svg)
5-Benzyl-4-methyl-2-[(4-methylphenyl)sulfonylamino]thiophene-3-carboxamide
CAS 304667-91-2C20H20N2O3S2
N-(4-Mesitylthiazol-2-yl)-2-(methylsulfonyl)benzamide
CAS 896362-69-9C20H20N2O3S2
N-(Naphthalen-1-yl)-1-(thiophene-2-sulfonyl)piperidine-2-carboxamide
CAS 1049832-01-0C20H20N2O3S2
N-(4-(2,5-Dimethoxyphenyl)thiazol-2-yl)-2-(ethylthio)benzamide
CAS 898458-79-2C20H20N2O3S2
![Methyl 4-[(5,6-dimethyl-4-oxo-3-prop-2-enylthieno[2,3-d]pyrimidin-2-yl)sulfanylmethyl]benzoate chemical structure, C20H20N2O3S2, CAS 325693-48-9](/s/FZEZMLHSQXUFFK-UHFFFAOYSA-N.svg)
Methyl 4-[(5,6-dimethyl-4-oxo-3-prop-2-enylthieno[2,3-d]pyrimidin-2-yl)sulfanylmethyl]benzoate
CAS 325693-48-9C20H20N2O3S2
![Methyl 2-{[4-(4-methylphenyl)-3-oxo-8-thia-4,6-diazatricyclo[7.4.0.0,2,7]trideca-1(9),2(7),5-trien-5-yl]sulfanyl}acetate chemical structure, C20H20N2O3S2, CAS 312625-68-6](/s/VWIPGSBRLLDKFI-UHFFFAOYSA-N.svg)
Methyl 2-{[4-(4-methylphenyl)-3-oxo-8-thia-4,6-diazatricyclo[7.4.0.0,2,7]trideca-1(9),2(7),5-trien-5-yl]sulfanyl}acetate
CAS 312625-68-6C20H20N2O3S2
![Methyl 4-[(3-methyl-4-oxo-3,5,6,7,8-pentahydrobenzo[b]thiopheno[2,3-d]pyrimidi n-2-ylthio)methyl]benzoate chemical structure, C20H20N2O3S2, CAS 315239-33-9](/s/BQFZNPLIXDNGJY-UHFFFAOYSA-N.svg)
Methyl 4-[(3-methyl-4-oxo-3,5,6,7,8-pentahydrobenzo[b]thiopheno[2,3-d]pyrimidi n-2-ylthio)methyl]benzoate
CAS 315239-33-9C20H20N2O3S2
![Methyl [(6-methyl-4-oxo-3-phenyl-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl)thio]acetate chemical structure, C20H20N2O3S2, CAS 6153-30-6](/s/OGRYFVQYYPBQGG-UHFFFAOYSA-N.svg)
Methyl [(6-methyl-4-oxo-3-phenyl-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl)thio]acetate
CAS 6153-30-6C20H20N2O3S2
![Butyl 4-[[2-(2-benzothiazolylthio)acetyl]amino]benzoate chemical structure, C20H20N2O3S2, CAS 296273-26-2](/s/JBWKTIFROREUSQ-UHFFFAOYSA-N.svg)
Butyl 4-[[2-(2-benzothiazolylthio)acetyl]amino]benzoate
CAS 296273-26-2C20H20N2O3S2
![2-{[2-(4-Methoxyphenyl)-2-oxoethyl]sulfanyl}-3-methyl-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one chemical structure, C20H20N2O3S2, CAS 332937-72-1](/s/DYFMJRJSZZMSHU-UHFFFAOYSA-N.svg)
2-{[2-(4-Methoxyphenyl)-2-oxoethyl]sulfanyl}-3-methyl-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one
CAS 332937-72-1C20H20N2O3S2
(E)-N-(2,3-Dimethylphenyl)-4-(5-(furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)butanamide
CAS 637318-78-6C20H20N2O3S2
N-(6-Methylsulfonyl-1,3-benzothiazol-2-yl)-1-phenylcyclopentane-1-carboxamide
CAS 1022237-89-3C20H20N2O3S2
2-Benzylsulfonyl-N-(5-ethyl-4-phenyl-1,3-thiazol-2-yl)acetamide
CAS 701229-58-5C20H20N2O3S2
![(E)-Isopropyl 2-(2-cyano-3-(thiophen-2-yl)acrylamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate chemical structure, C20H20N2O3S2, CAS 500267-87-8](/s/LWPPDZGWOTUBLB-JLHYYAGUSA-N.svg)
(E)-Isopropyl 2-(2-cyano-3-(thiophen-2-yl)acrylamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate
CAS 500267-87-8C20H20N2O3S2
(E)-N-(2,4-Dimethylphenyl)-4-(5-(furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)butanamide
CAS 637318-79-7C20H20N2O3S2
- (E)-N-(3,4-Dimethylphenyl)-4-(5-(furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)butanamide637318-80-0C20H20N2O3S2
- (E)-N-(2-Ethylphenyl)-4-(5-(furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)butanamide637318-81-1C20H20N2O3S2
- (E)-3-(5-(Furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)-N-mesitylpropanamide682783-41-1C20H20N2O3S2
- (E)-4-(5-(Furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)-N-phenethylbutanamide682764-12-1C20H20N2O3S2
- (E)-N-Benzyl-4-(5-(furan-2-ylmethylene)-4-oxo-2-thioxothiazolidin-3-yl)-N-methylbutanamide682764-65-4C20H20N2O3S2
- N-{4-[(2-Phenylethyl)sulfamoyl]phenyl}-2-(thiophen-2-yl)acetamide600137-31-3C20H20N2O3S2
- Ethyl 4-{[2-(1,3-benzothiazol-2-ylsulfanyl)butanoyl]amino}benzoate713080-72-9C20H20N2O3S2
- N-(4-(2,4-Dimethoxyphenyl)thiazol-2-yl)-3-(phenylthio)propanamide476628-66-7C20H20N2O3S2
- N-[(2Z)-3-Benzyl-5,5-dioxidotetrahydrothieno[3,4-d][1,3]thiazol-2(3H)-ylidene]-2-phenylacetamide900274-98-8C20H20N2O3S2
- 2-[4-(Phenylmethanesulfonamido)phenyl]-N-[(thiophen-2-yl)methyl]acetamide1060261-60-0C20H20N2O3S2
- Ethyl 4-{3-[2-methyl-4-(thiophen-2-yl)-1,3-thiazol-5-yl]propanamido}benzoate1017663-29-4C20H20N2O3S2
- N-(4-Methylbenzyl)-3-[methyl(phenylsulfonyl)amino]thiophene-2-carboxamide1226434-81-6C20H20N2O3S2
- N-[4-[Benzyl(methyl)sulfamoyl]phenyl]-2-thiophen-2-ylacetamide710978-73-7C20H20N2O3S2
- Ethyl 2-[[2-(4-methylphenyl)-1-oxo-7,8-dihydro-6H-cyclopenta[2,3]thieno[2,4-b]pyrimidin-3-yl]sulfanyl]acetate330946-12-8C20H20N2O3S2
- Methyl 2-[[3-(2-methylphenyl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetate380595-77-7C20H20N2O3S2
- (E)-Methyl 2-(3-cinnamoylthioureido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate642943-18-8C20H20N2O3S2
- N-(4-(3,4-Dimethoxyphenyl)thiazol-2-yl)-2-(ethylthio)benzamide922689-79-0C20H20N2O3S2
- N-(4-(2,5-Dimethoxyphenyl)thiazol-2-yl)-2-(4-(methylthio)phenyl)acetamide919844-14-7C20H20N2O3S2
- 4-(Isopropylsulfonyl)-N-(4-(p-tolyl)thiazol-2-yl)benzamide919846-95-0C20H20N2O3S2
- 4-[3-(Methylsulfanyl)phenyl]-2-(pyrrolidine-1-carbonyl)-4H-1lambda6,4-benzothiazine-1,1-dione1207027-98-2C20H20N2O3S2
- N-(3,4-Dimethylphenyl)-3-[methyl(phenylsulfonyl)amino]thiophene-2-carboxamide1226443-58-8C20H20N2O3S2
- N-(3,5-Dimethylphenyl)-3-[methyl(phenylsulfonyl)amino]thiophene-2-carboxamide1226435-07-9C20H20N2O3S2
- N-(3-Ethylphenyl)-3-[methyl(phenylsulfonyl)amino]thiophene-2-carboxamide1226436-58-3C20H20N2O3S2
- 3-(4-(Methylsulfonyl)phenyl)-N-((2-(thiophen-2-yl)pyridin-4-yl)methyl)propanamide2034346-81-9C20H20N2O3S2
- 2-{[2-(4-Methoxyphenyl)-2-oxoethyl]sulfanyl}-5,6-dimethyl-3-(prop-2-en-1-yl)thieno[2,3-d]pyrimidin-4(3H)-one625822-40-4C20H20N2O3S2
- (1Z)-1-(3-Ethyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)-8-methoxy-4,4,6-trimethyl-4H-pyrrolo[3,2,1-ij]quinolin-2(1H)-one696631-97-7C20H20N2O3S2
- N-(4-(2,5-Dimethylphenyl)thiazol-2-yl)-3-(ethylsulfonyl)benzamide898423-19-3C20H20N2O3S2
- 4-Methanesulfonyl-N-[4-(2,4,6-trimethylphenyl)-1,3-thiazol-2-yl]benzamide896339-67-6C20H20N2O3S2
- N-(4-(4-Methoxyphenyl)-5-methylthiazol-2-yl)-2-((4-methoxyphenyl)thio)acetamide923078-17-5C20H20N2O3S2
- N-(4-(4-Methoxyphenyl)thiazol-2-yl)-3-((4-methoxyphenyl)thio)propanamide922937-56-2C20H20N2O3S2
- N-(4-(2,4-Dimethoxyphenyl)thiazol-2-yl)-2-(4-(methylthio)phenyl)acetamide941930-16-1C20H20N2O3S2
- N-(4-(2,5-Dimethylphenyl)thiazol-2-yl)-2-(4-(methylsulfonyl)phenyl)acetamide919848-70-7C20H20N2O3S2
- 3-(Isopropylsulfonyl)-N-(4-(p-tolyl)thiazol-2-yl)benzamide919862-24-1C20H20N2O3S2
- (E)-Ethyl 2-(2-cyano-3-(thiophen-2-yl)acrylamido)-6-methyl-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate868154-69-2C20H20N2O3S2
- 3-[Methyl(3-methylphenyl)sulfamoyl]-N-(3-methylphenyl)thiophene-2-carboxamide1207020-21-0C20H20N2O3S2
- 2-(4-(((4-Methylthiazol-2-yl)thio)methyl)piperidine-1-carbonyl)-4H-chromen-4-one1428373-71-0C20H20N2O3S2
- N1-((5-(hydroxy(thiophen-2-yl)methyl)thiophen-2-yl)methyl)-N2-(1-phenylethyl)oxalamide1421491-16-8C20H20N2O3S2
- N1-((5-(hydroxy(thiophen-2-yl)methyl)thiophen-2-yl)methyl)-N2-phenethyloxalamide1421484-41-4C20H20N2O3S2
- (Z)-Methyl 2-(6-methyl-2-((3-(phenylthio)propanoyl)imino)benzo[d]thiazol-3(2H)-yl)acetate941961-26-8C20H20N2O3S2
- N-(4-(p-Tolyl)thiazol-2-yl)-3-tosylpropanamide895473-95-7C20H20N2O3S2
- N-(4-(3,4-Dimethoxyphenyl)thiazol-2-yl)-2-(p-tolylthio)acetamide895455-13-7C20H20N2O3S2
- N-(4-(2,4-Dimethoxyphenyl)thiazol-2-yl)-2-(p-tolylthio)acetamide895456-46-9C20H20N2O3S2
- N-(4-(2,5-Dimethoxyphenyl)thiazol-2-yl)-2-(p-tolylthio)acetamide895457-33-7C20H20N2O3S2
- N-(4-(2,5-Dimethylphenyl)thiazol-2-yl)-2-(ethylsulfonyl)benzamide898422-86-1C20H20N2O3S2
- N-(4-(3,4-Dimethoxyphenyl)thiazol-2-yl)-4-(ethylthio)benzamide898429-31-7C20H20N2O3S2
- N-(4-(2,5-Dimethylphenyl)thiazol-2-yl)-2-tosylacetamide895443-96-6C20H20N2O3S2
- N-(4-(2,4-Dimethylphenyl)thiazol-2-yl)-2-tosylacetamide895444-04-9C20H20N2O3S2
- N-(4-(3,4-Dimethylphenyl)thiazol-2-yl)-2-tosylacetamide895444-12-9C20H20N2O3S2
- N-(4-Mesitylthiazol-2-yl)-3-(methylsulfonyl)benzamide896286-13-8C20H20N2O3S2
- N-(4-(2,4-Dimethylphenyl)thiazol-2-yl)-2-(ethylsulfonyl)benzamide922668-73-3C20H20N2O3S2
- N-(4-(3,4-Dimethylphenyl)thiazol-2-yl)-2-(ethylsulfonyl)benzamide922816-89-5C20H20N2O3S2
- N-(4-(3,4-Dimethoxyphenyl)thiazol-2-yl)-3-(ethylthio)benzamide941891-19-6C20H20N2O3S2
- N-(4-(2,4-Dimethoxyphenyl)thiazol-2-yl)-3-(ethylthio)benzamide922670-85-7C20H20N2O3S2
- N-(4-(2,5-Dimethoxyphenyl)thiazol-2-yl)-3-(ethylthio)benzamide922592-44-7C20H20N2O3S2
- N-(4-(4-Ethylphenyl)thiazol-2-yl)-3-(ethylsulfonyl)benzamide922646-47-7C20H20N2O3S2
- N-(4-(2,4-Dimethylphenyl)thiazol-2-yl)-3-(ethylsulfonyl)benzamide922672-31-9C20H20N2O3S2
- N-(4-(3,4-Dimethylphenyl)thiazol-2-yl)-3-(ethylsulfonyl)benzamide922818-67-5C20H20N2O3S2
- N-(4-(2,4-Dimethoxyphenyl)thiazol-2-yl)-4-(ethylthio)benzamide922823-54-9C20H20N2O3S2
- N-(4-(2,5-Dimethoxyphenyl)thiazol-2-yl)-4-(ethylthio)benzamide922571-65-1C20H20N2O3S2
- N-(4-(4-Ethylphenyl)thiazol-2-yl)-4-(ethylsulfonyl)benzamide922697-75-4C20H20N2O3S2
- N-(4-(2,5-Dimethylphenyl)thiazol-2-yl)-4-(ethylsulfonyl)benzamide941936-75-0C20H20N2O3S2
- N-(4-(2,4-Dimethylphenyl)thiazol-2-yl)-4-(ethylsulfonyl)benzamide922697-78-7C20H20N2O3S2
- N-(4-(3,4-Dimethylphenyl)thiazol-2-yl)-4-(ethylsulfonyl)benzamide922824-30-4C20H20N2O3S2
- 2-(2-((3,5-Dimethoxybenzyl)thio)thiazol-4-yl)-N-phenylacetamide942001-76-5C20H20N2O3S2
- N-(4-(4-Methoxy-3-methylphenyl)thiazol-2-yl)-2-((4-methoxyphenyl)thio)acetamide922884-37-5C20H20N2O3S2
- N-(4-(4-Ethoxyphenyl)thiazol-2-yl)-2-((4-methoxyphenyl)thio)acetamide923102-96-9C20H20N2O3S2
- N-(4-(4-Ethylphenyl)thiazol-2-yl)-2-(4-(methylsulfonyl)phenyl)acetamide919753-59-6C20H20N2O3S2
- N-(4-(2,4-Dimethylphenyl)thiazol-2-yl)-2-(4-(methylsulfonyl)phenyl)acetamide919753-68-7C20H20N2O3S2
- N-(4-(3,4-Dimethylphenyl)thiazol-2-yl)-2-(4-(methylsulfonyl)phenyl)acetamide919848-73-0C20H20N2O3S2
- 2-(4-(Ethylsulfonyl)phenyl)-N-(4-(p-tolyl)thiazol-2-yl)acetamide919853-35-3C20H20N2O3S2
- N-[4,5-Dimethyl-3-(phenylsulfonyl)-1-(prop-2-en-1-yl)-1H-pyrrol-2-yl]thiophene-2-carboxamide1010913-81-1C20H20N2O3S2
- 3-(N-Methyl4-methylbenzenesulfonamido)-N-(3-methylphenyl)thiophene-2-carboxamide1226427-13-9C20H20N2O3S2
- 3-(N-Methyl4-methylbenzenesulfonamido)-N-(4-methylphenyl)thiophene-2-carboxamide1226434-13-4C20H20N2O3S2
- N1-(2-(benzo[b]thiophen-2-yl)-2-hydroxypropyl)-N2-(2-(methylthio)phenyl)oxalamide2034604-93-6C20H20N2O3S2
- 3-(4-(Methylsulfonyl)phenyl)-N-((5-(thiophen-3-yl)pyridin-3-yl)methyl)propanamide1705980-02-4C20H20N2O3S2
- N1-(2-hydroxy-2-(thiophen-2-yl)-2-(thiophen-3-yl)ethyl)-N2-(1-phenylethyl)oxalamide2034483-41-3C20H20N2O3S2
Frequently asked questions
What is the molar mass of C20H20N2O3S2?
The molar mass of C20H20N2O3S2 is 400.51 g/mol, calculated from standard atomic weights for 20 carbon atoms, 20 hydrogen atoms, 2 nitrogen atoms, 3 oxygen atoms and 2 sulfur atoms. The monoisotopic mass is 400.0915 Da.
How many compounds have the formula C20H20N2O3S2?
CompoundList lists 108 compounds with the molecular formula C20H20N2O3S2, including N-[4-[(2,4,6-Trimethylphenyl)sulfamoyl]phenyl]thiophene-2-carboxamide, Ethyl [(4-oxo-3-phenyl-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl)sulfanyl]acetate, Ethyl 2-(2-((1H-indol-3-yl)thio)acetamido)-5,6-dihydro-4H-cyclopenta[b]thiophene-3-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 C20H20N2O3S2?
C20H20N2O3S2 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.