Molecular formula
C21H25N3O3S2
74 compounds have this formula on CompoundList.
- Molar mass
- 431.57g/mol
- Monoisotopic mass
- 431.1337Da
- Atoms
- 54
- Elements
- 5
- Rings plus double bonds
- 11
The formula C21H25N3O3S2 describes a molecule made of 21 carbon atoms, 25 hydrogen atoms, 3 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 × 2158.45%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 255.84%1.008 × 25 = 25.200 g/mol
- N Nitrogen × 39.74%14.007 × 3 = 42.021 g/mol
- O Oxygen × 311.12%15.999 × 3 = 47.997 g/mol
- S Sulfur × 214.86%32.06 × 2 = 64.120 g/mol
Look up another formula
Compounds with the formula C21H25N3O3S2
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 74 of 74 compounds
![Ethyl ({4-Oxo-3-[3-(Pyrrolidin-1-Yl)propyl]-3,4-Dihydro[1]benzothieno[3,2-D]pyrimidin-2-Yl}sulfanyl)acetate chemical structure, C21H25N3O3S2, CAS 896795-60-1](/s/SKDRHRAYBYQVNU-UHFFFAOYSA-N.svg)
Ethyl ({4-Oxo-3-[3-(Pyrrolidin-1-Yl)propyl]-3,4-Dihydro[1]benzothieno[3,2-D]pyrimidin-2-Yl}sulfanyl)acetate
CAS 896795-60-1C21H25N3O3S2
![N-[4-[2-(Cyclohexanecarbonyl)-3-thiophen-2-yl-3,4-dihydropyrazol-5-yl]phenyl]methanesulfonamide chemical structure, C21H25N3O3S2, CAS 851718-31-5](/s/VHRGUYDJLGOKGD-UHFFFAOYSA-N.svg)
N-[4-[2-(Cyclohexanecarbonyl)-3-thiophen-2-yl-3,4-dihydropyrazol-5-yl]phenyl]methanesulfonamide
CAS 851718-31-5C21H25N3O3S2
![2-((3-Benzyl-6-methyl-4-oxo-3,4,6,7-tetrahydrothieno[3,2-d]pyrimidin-2-yl)thio)-N-((tetrahydrofuran-2-yl)methyl)acetamide chemical structure, C21H25N3O3S2, CAS 689262-92-8](/s/XVDYAKZWFRVEBQ-UHFFFAOYSA-N.svg)
2-((3-Benzyl-6-methyl-4-oxo-3,4,6,7-tetrahydrothieno[3,2-d]pyrimidin-2-yl)thio)-N-((tetrahydrofuran-2-yl)methyl)acetamide
CAS 689262-92-8C21H25N3O3S2
![2-[2-(3,4-Dihydro-2H-quinolin-1-yl)-2-oxoethyl]sulfanyl-3-(2-methoxyethyl)-6-methyl-6,7-dihydrothieno[3,2-d]pyrimidin-4-one chemical structure, C21H25N3O3S2, CAS 851409-92-2](/s/TUGASCRYVWREDC-UHFFFAOYSA-N.svg)
2-[2-(3,4-Dihydro-2H-quinolin-1-yl)-2-oxoethyl]sulfanyl-3-(2-methoxyethyl)-6-methyl-6,7-dihydrothieno[3,2-d]pyrimidin-4-one
CAS 851409-92-2C21H25N3O3S2
![2-[1-Ethyl-5-oxo-2-sulfanylidene-3-(thiophen-2-ylmethyl)imidazolidin-4-yl]-N-(4-propoxyphenyl)acetamide chemical structure, C21H25N3O3S2, CAS 1022918-68-8](/s/LRGVFCRZKXPVPQ-UHFFFAOYSA-N.svg)
2-[1-Ethyl-5-oxo-2-sulfanylidene-3-(thiophen-2-ylmethyl)imidazolidin-4-yl]-N-(4-propoxyphenyl)acetamide
CAS 1022918-68-8C21H25N3O3S2
![N-{[(4-{[Benzyl(methyl)amino]sulfonyl}phenyl)amino]carbonothioyl}cyclopentanecarboxamide chemical structure, C21H25N3O3S2, CAS 714203-00-6](/s/IXUXIQLFNWZONW-UHFFFAOYSA-N.svg)
N-{[(4-{[Benzyl(methyl)amino]sulfonyl}phenyl)amino]carbonothioyl}cyclopentanecarboxamide
CAS 714203-00-6C21H25N3O3S2
![4-(N,N-Diallylsulfamoyl)-N-(6-methyl-4,5,6,7-tetrahydrobenzo[d]thiazol-2-yl)benzamide chemical structure, C21H25N3O3S2, CAS 361481-65-4](/s/BGWUKLOCKNLOGA-UHFFFAOYSA-N.svg)
4-(N,N-Diallylsulfamoyl)-N-(6-methyl-4,5,6,7-tetrahydrobenzo[d]thiazol-2-yl)benzamide
CAS 361481-65-4C21H25N3O3S2
![N-(4-Ethoxyphenyl)-2-[3-(3-methylbutyl)-4-oxothieno[3,2-d]pyrimidin-2-yl]sulfanylacetamide chemical structure, C21H25N3O3S2, CAS 440329-76-0](/s/XMXUMOWLKPVKKB-UHFFFAOYSA-N.svg)
N-(4-Ethoxyphenyl)-2-[3-(3-methylbutyl)-4-oxothieno[3,2-d]pyrimidin-2-yl]sulfanylacetamide
CAS 440329-76-0C21H25N3O3S2
![Benzo[B]thiophene-3-carboxamide, 2-[[[cyclopentyl(2-thienylcarbonyl)amino]acetyl]amino]-4,5,6,7-tetrahydro- chemical structure, C21H25N3O3S2, CAS 606108-90-1](/s/UPPRJTWJCKSXSM-UHFFFAOYSA-N.svg)
Benzo[B]thiophene-3-carboxamide, 2-[[[cyclopentyl(2-thienylcarbonyl)amino]acetyl]amino]-4,5,6,7-tetrahydro-
CAS 606108-90-1C21H25N3O3S2
4-(2-(Benzylthio)-4,5-dihydro-1H-imidazole-1-carbonyl)-N,N-diethylbenzenesulfonamide
CAS 851864-52-3C21H25N3O3S2
![3-(2-Methoxyphenyl)-2-[2-(4-methylpiperidin-1-yl)-2-oxoethyl]sulfanyl-6,7-dihydrothieno[3,2-d]pyrimidin-4-one chemical structure, C21H25N3O3S2, CAS 686772-01-0](/s/SIKGVXVHJJOGHY-UHFFFAOYSA-N.svg)
3-(2-Methoxyphenyl)-2-[2-(4-methylpiperidin-1-yl)-2-oxoethyl]sulfanyl-6,7-dihydrothieno[3,2-d]pyrimidin-4-one
CAS 686772-01-0C21H25N3O3S2
![N-(3-Cyano-5,6-dihydro-4H-cyclopenta[b]thiophen-2-yl)-4-(N,N-dipropylsulfamoyl)benzamide chemical structure, C21H25N3O3S2, CAS 312917-46-7](/s/DRPAZXKCWFOAOK-UHFFFAOYSA-N.svg)
N-(3-Cyano-5,6-dihydro-4H-cyclopenta[b]thiophen-2-yl)-4-(N,N-dipropylsulfamoyl)benzamide
CAS 312917-46-7C21H25N3O3S2
![4-(N-Butyl-N-methylsulfamoyl)-N-(4-ethylbenzo[d]thiazol-2-yl)benzamide chemical structure, C21H25N3O3S2, CAS 892852-56-1](/s/XRIWSAUSZDLFEU-UHFFFAOYSA-N.svg)
4-(N-Butyl-N-methylsulfamoyl)-N-(4-ethylbenzo[d]thiazol-2-yl)benzamide
CAS 892852-56-1C21H25N3O3S2
![Prop-2-en-1-yl 7-methyl-2-[(2-methylpropyl)sulfanyl]-5-(3-methylthiophen-2-yl)-4-oxo-3H,4H,5H,8H-pyrido[2,3-d]pyrimidine-6-carboxylate chemical structure, C21H25N3O3S2, CAS 923900-66-7](/s/ZWCQHWPSXADJGK-UHFFFAOYSA-N.svg)
Prop-2-en-1-yl 7-methyl-2-[(2-methylpropyl)sulfanyl]-5-(3-methylthiophen-2-yl)-4-oxo-3H,4H,5H,8H-pyrido[2,3-d]pyrimidine-6-carboxylate
CAS 923900-66-7C21H25N3O3S2
![N-Cyclohexyl-2-[3-(furan-2-ylmethyl)-5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-2-yl]sulfanylacetamide chemical structure, C21H25N3O3S2, CAS 878683-72-8](/s/WWKCFFOJUOGAGT-UHFFFAOYSA-N.svg)
N-Cyclohexyl-2-[3-(furan-2-ylmethyl)-5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-2-yl]sulfanylacetamide
CAS 878683-72-8C21H25N3O3S2
![3-(4-Ethoxyphenyl)-2-((2-oxo-2-(piperidin-1-yl)ethyl)thio)-6,7-dihydrothieno[3,2-d]pyrimidin-4(3H)-one chemical structure, C21H25N3O3S2, CAS 362501-88-0](/s/BCRMUVQASHBNAV-UHFFFAOYSA-N.svg)
3-(4-Ethoxyphenyl)-2-((2-oxo-2-(piperidin-1-yl)ethyl)thio)-6,7-dihydrothieno[3,2-d]pyrimidin-4(3H)-one
CAS 362501-88-0C21H25N3O3S2
![2-((2-(Azepan-1-yl)-2-oxoethyl)thio)-3-(2-methoxyphenyl)-6,7-dihydrothieno[3,2-d]pyrimidin-4(3H)-one chemical structure, C21H25N3O3S2, CAS 362501-70-0](/s/WADOWEBHRFDBSU-UHFFFAOYSA-N.svg)
2-((2-(Azepan-1-yl)-2-oxoethyl)thio)-3-(2-methoxyphenyl)-6,7-dihydrothieno[3,2-d]pyrimidin-4(3H)-one
CAS 362501-70-0C21H25N3O3S2
4-(Dipropylsulfamoyl)-N-(3-methyl-1,3-benzothiazol-2-ylidene)benzamide
CAS 325986-84-3C21H25N3O3S2
![N-Cyclohexyl-2-[6-ethyl-3-(furan-2-ylmethyl)-4-oxothieno[2,3-d]pyrimidin-2-yl]sulfanylacetamide chemical structure, C21H25N3O3S2, CAS 717874-16-3](/s/FNRYUITUAKHNRC-UHFFFAOYSA-N.svg)
N-Cyclohexyl-2-[6-ethyl-3-(furan-2-ylmethyl)-4-oxothieno[2,3-d]pyrimidin-2-yl]sulfanylacetamide
CAS 717874-16-3C21H25N3O3S2
![Ethyl 2-({[3-(2-oxopyrrolidin-1-yl)propyl]carbamothioyl}amino)-5-phenylthiophene-3-carboxylate chemical structure, C21H25N3O3S2, CAS 708217-27-0](/s/GCVMFZAFEQVFFX-UHFFFAOYSA-N.svg)
Ethyl 2-({[3-(2-oxopyrrolidin-1-yl)propyl]carbamothioyl}amino)-5-phenylthiophene-3-carboxylate
CAS 708217-27-0C21H25N3O3S2
N-(3-Cyano-5-methyl-4,5,6,7-tetrahydro-1-benzothiophen-2-yl)-4-(diethylsulfamoyl)benzamide
CAS 391221-68-4C21H25N3O3S2
![N-(3-Cyano-4,5-dimethylthiophen-2-yl)-4-[cyclohexyl(methyl)sulfamoyl]benzamide chemical structure, C21H25N3O3S2, CAS 896304-81-7](/s/KKGQLBWOKMXGJY-UHFFFAOYSA-N.svg)
N-(3-Cyano-4,5-dimethylthiophen-2-yl)-4-[cyclohexyl(methyl)sulfamoyl]benzamide
CAS 896304-81-7C21H25N3O3S2
4-(Furan-2-yl)-2-((4-((4-propylphenyl)sulfonyl)piperazin-1-yl)methyl)thiazole
CAS 1169967-26-3C21H25N3O3S2
N-(4-(N-((1-Methyl-1H-pyrrol-2-yl)methyl)-N-(thiophen-2-ylmethyl)sulfamoyl)phenyl)isobutyramide
CAS 1286697-15-1C21H25N3O3S2
- 2-(4-(Isopropylsulfonyl)phenyl)-N-(2-(1-methyl-4-(thiophen-2-yl)-1H-imidazol-2-yl)ethyl)acetamide1421499-61-7C21H25N3O3S2
- 2-[(3Z)-3-[3-(2-Ethylhexyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]-2-oxoindol-1-yl]acetamide380571-82-4C21H25N3O3S2
- 4-(2-((2,5-Dimethylbenzyl)thio)-4,5-dihydro-1H-imidazole-1-carbonyl)-N,N-dimethylbenzenesulfonamide851804-66-5C21H25N3O3S2
- 4-[Butyl(ethyl)sulfamoyl]-N-(2-methyl-1,3-benzothiazol-5-yl)benzamide683261-47-4C21H25N3O3S2
- 2-((4-Butyl-1,1-dioxido-4H-benzo[e][1,2,4]thiadiazin-3-yl)thio)-N-(2,6-dimethylphenyl)acetamide893790-18-6C21H25N3O3S2
- 2-((2-(Azepan-1-yl)-2-oxoethyl)thio)-3-(3-methoxyphenyl)-6,7-dihydrothieno[3,2-d]pyrimidin-4(3H)-one877654-78-9C21H25N3O3S2
- N-(4-Methoxybenzyl)-2-{[3-(3-methylbutyl)-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl]sulfanyl}acetamide1252817-54-1C21H25N3O3S2
- N-(2-Methoxy-5-methylphenyl)-2-{[3-(3-methylbutyl)-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl]sulfanyl}acetamide1252860-09-5C21H25N3O3S2
- 2-{[3-(3-Methoxybenzyl)-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-2-yl]sulfanyl}-N-(3-methylbutyl)acetamide1252927-63-1C21H25N3O3S2
- N-((1-(Benzo[d]thiazol-2-yl)piperidin-4-yl)methyl)-4-methoxy-2-methylbenzenesulfonamide1797591-86-6C21H25N3O3S2
- N-[[4-[Methyl(phenyl)sulfamoyl]phenyl]carbamothioyl]cyclohexanecarboxamide714279-10-4C21H25N3O3S2
- N,N-Diethyl-2-{[3-(furan-2-ylmethyl)-4-oxo-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl]sulfanyl}acetamide577963-71-4C21H25N3O3S2
- (Z)-4-(N-Butyl-N-methylsulfamoyl)-N-(3,4-dimethylbenzo[d]thiazol-2(3H)-ylidene)benzamide850911-04-5C21H25N3O3S2
- (E)-4-(N-Butyl-N-ethylsulfamoyl)-N-(3-methylbenzo[d]thiazol-2(3H)-ylidene)benzamide683260-99-3C21H25N3O3S2
- (E)-4-(N-Butyl-N-methylsulfamoyl)-N-(3,6-dimethylbenzo[d]thiazol-2(3H)-ylidene)benzamide683261-06-5C21H25N3O3S2
- 2-((4-Butyl-1,1-dioxido-4H-benzo[e][1,2,4]thiadiazin-3-yl)thio)-N-(4-ethylphenyl)acetamide893789-98-5C21H25N3O3S2
- 6-Acetyl-2-(4-(p-tolylthio)butanamido)-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carboxamide941966-49-0C21H25N3O3S2
- 3-Methyl-2-(2-methyl-1,3-benzothiazole-6-sulfonamido)-N-(2-phenylethyl)butanamide1086120-15-1C21H25N3O3S2
- 2-[(1,1-Dioxo-4-propyl-4H-1lambda6,2,4-benzothiadiazin-3-yl)sulfanyl]-N-(3-phenylpropyl)acetamide932992-99-9C21H25N3O3S2
- 2-[(4-Butyl-1,1-dioxo-4H-1lambda6,2,4-benzothiadiazin-3-yl)sulfanyl]-N-(2-phenylethyl)acetamide932967-26-5C21H25N3O3S2
- 2-((4-Butyl-1,1-dioxido-4H-benzo[e][1,2,4]thiadiazin-3-yl)thio)-N-(3,4-dimethylphenyl)acetamide933024-36-3C21H25N3O3S2
- 2-((4-Butyl-1,1-dioxido-4H-benzo[e][1,2,4]thiadiazin-3-yl)thio)-N-(4-methylbenzyl)acetamide932967-30-1C21H25N3O3S2
- 2-((4-Butyl-1,1-dioxido-4H-benzo[e][1,2,4]thiadiazin-3-yl)thio)-N-(3-ethylphenyl)acetamide933213-15-1C21H25N3O3S2
- 2-[(4-Butyl-1,1-dioxo-4H-1lambda6,2,4-benzothiadiazin-3-yl)sulfanyl]-N-(2,5-dimethylphenyl)acetamide933213-19-5C21H25N3O3S2
- 2-((4-Benzyl-1,1-dioxido-4H-benzo[e][1,2,4]thiadiazin-3-yl)thio)-N-isopentylacetamide950454-37-2C21H25N3O3S2
- 3-(4-tert-Butylphenyl)-8-(thiophene-2-sulfonyl)-1,4,8-triazaspiro[4.5]dec-3-EN-2-one1185154-99-7C21H25N3O3S2
- (Z)-4-(N,N-Diethylsulfamoyl)-N-(3-ethyl-6-methylbenzo[d]thiazol-2(3H)-ylidene)benzamide850908-97-3C21H25N3O3S2
- (E)-4-(N-Butyl-N-methylsulfamoyl)-N-(3-ethylbenzo[d]thiazol-2(3H)-ylidene)benzamide850910-84-8C21H25N3O3S2
- 4-(Diethylsulfamoyl)-N-(3,4,5-trimethyl-1,3-benzothiazol-2-ylidene)benzamide850911-29-4C21H25N3O3S2
- 4-(Dipropylsulfamoyl)-N-(2-methyl-1,3-benzothiazol-5-yl)benzamide392237-07-9C21H25N3O3S2
- (E)-4-(N,N-Diethylsulfamoyl)-N-(3,4,6-trimethylbenzo[d]thiazol-2(3H)-ylidene)benzamide850903-03-6C21H25N3O3S2
- [(1-Cyanocyclohexyl)(methyl)carbamoyl]methyl 4-(1,3-benzothiazol-2-ylsulfanyl)butanoate940851-19-4C21H25N3O3S2
- 2-((3-(3,5-Dimethylphenyl)-4-oxo-3,4,6,7-tetrahydrothieno[3,2-d]pyrimidin-2-yl)thio)-N-((tetrahydrofuran-2-yl)methyl)acetamide877653-86-6C21H25N3O3S2
- 3-(3-Methoxyphenyl)-2-((2-(4-methylpiperidin-1-yl)-2-oxoethyl)thio)-6,7-dihydrothieno[3,2-d]pyrimidin-4(3H)-one877654-80-3C21H25N3O3S2
- N-Cyclohexyl-2-((3-(3-methoxyphenyl)-4-oxo-3,4,6,7-tetrahydrothieno[3,2-d]pyrimidin-2-yl)thio)acetamide877655-47-5C21H25N3O3S2
- 7-Acetyl-3-(2-furylmethyl)-2-(isopentylsulfanyl)-5,6,7,8-tetrahydropyrido[4',3':4,5]thieno[2,3-D]pyrimidin-4(3H)-one892303-82-1C21H25N3O3S2
- 4-(Diethylsulfamoyl)-N-[6-(propan-2-yl)-1,3-benzothiazol-2-yl]benzamide892853-97-3C21H25N3O3S2
- N-(3-Cyano-4,5-dimethylthiophen-2-yl)-4-[(3,5-dimethylpiperidin-1-yl)sulfonyl]benzamide896302-69-5C21H25N3O3S2
- N-((1-(Benzo[d]thiazol-2-yl)piperidin-4-yl)methyl)-4-methoxy-3-methylbenzenesulfonamide1797852-38-0C21H25N3O3S2
- 5-((1-((5-Ethylthiophen-2-yl)sulfonyl)piperidin-3-yl)methyl)-3-(o-tolyl)-1,2,4-oxadiazole1706014-00-7C21H25N3O3S2
- 2-(Benzylthio)-1-(4-(3-methyl-2,2-dioxidobenzo[c][1,2,5]thiadiazol-1(3H)-yl)piperidin-1-yl)ethanone2034415-17-1C21H25N3O3S2
- N-[(4-Cyclohexyl-1,3-thiazol-2-yl)methyl]-11-oxo-1-azatricyclo[6.3.1.0^{4,12}]dodeca-4(12),5,7-triene-6-sulfonamide2034335-96-9C21H25N3O3S2
- 1-(4-(3-Methyl-2,2-dioxidobenzo[c][1,2,5]thiadiazol-1(3H)-yl)piperidin-1-yl)-3-(phenylthio)propan-1-one2034509-56-1C21H25N3O3S2
- 3-[(2Z)-3-(3-Methoxypropyl)-2-(phenylimino)-2,3-dihydro-1,3-thiazol-4-yl]-N,N-dimethylbenzenesulfonamide845633-91-2C21H25N3O3S2
- 4-[Butyl(methyl)sulfamoyl]-N-(5,7-dimethyl-1,3-benzothiazol-2-yl)benzamide905676-61-1C21H25N3O3S2
- N-(2-(Benzo[b]thiophen-3-yl)-2-(dimethylamino)ethyl)-4-(N,N-dimethylsulfamoyl)benzamide2034390-99-1C21H25N3O3S2
- N-[2-(3-Cyclopropyl-2,2-dioxo-1,3-dihydro-2lambda6,1,3-benzothiadiazol-1-yl)ethyl]-1-(thiophen-2-yl)cyclopentane-1-carboxamide2097921-17-8C21H25N3O3S2
- N-[2-(Methylsulfanyl)phenyl]-2-[4-(2-phenylethenesulfonyl)piperazin-1-yl]acetamide790250-92-9C21H25N3O3S2
- 2-[[(1,4-Dihydro-5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-2-yl)methyl]thio]-N-[2-(4-methoxyphenyl)ethyl]propanamide1095822-64-2C21H25N3O3S2
- N-[2-(Dimethylamino)ethyl]-3-methyl-N-[6-(methylsulfonyl)-2-benzothiazolyl]benzeneacetamide1170891-88-9C21H25N3O3S2
Frequently asked questions
What is the molar mass of C21H25N3O3S2?
The molar mass of C21H25N3O3S2 is 431.57 g/mol, calculated from standard atomic weights for 21 carbon atoms, 25 hydrogen atoms, 3 nitrogen atoms, 3 oxygen atoms and 2 sulfur atoms. The monoisotopic mass is 431.1337 Da.
How many compounds have the formula C21H25N3O3S2?
CompoundList lists 74 compounds with the molecular formula C21H25N3O3S2, including Ethyl ({4-Oxo-3-[3-(Pyrrolidin-1-Yl)propyl]-3,4-Dihydro[1]benzothieno[3,2-D]pyrimidin-2-Yl}sulfanyl)acetate, N-[4-[2-(Cyclohexanecarbonyl)-3-thiophen-2-yl-3,4-dihydropyrazol-5-yl]phenyl]methanesulfonamide, 2-((3-Benzyl-6-methyl-4-oxo-3,4,6,7-tetrahydrothieno[3,2-d]pyrimidin-2-yl)thio)-N-((tetrahydrofuran-2-yl)methyl)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 C21H25N3O3S2?
C21H25N3O3S2 has a degree of unsaturation of 11. 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.