cefsumide cefsumide cefsumide is an antibiotic of the cephalosporin group. cefsumide names iupac name 7β--3-methyl-3,4-didehydrocepham-4-carboxylic acid systematic iupac name (6r,7r)-7--3-methyl-8-oxo-5-thia-1-azabicyclooct-2-ene-2-carboxylic acid identifiers cas number 54818-11-0 y 3d model (jsmol) interactive image chembl chembl2375142 chemspider 61968 pubchem cid 68718 unii 3642w81j7a y inchi inchi=1s/c17h20n4o6s2/c1-8-7-28-16-12(15(23)21(16)13(8)17(24)25)19-14(22)11(18)9-4-3-5-10(6-9)20-29(2,26)27/h3-6,11-12,16,20h,7,18h2,1-2h3,(h,19,22)(h,24,25)/t11-,12-,16-/m1/s1key: ofkrkchcywqzly-xhbswpgzsa-ninchi=1/c17h20n4o6s2/c1-8-7-28-16-12(15(23)21(16)13(8)17(24)25)19-14(22)11(18)9-4-3-5-10(6-9)20-29(2,26)27/h3-6,11-12,16,20h,7,18h2,1-2h3,(h,19,22)(h,24,25)/t11-,12-,16-/m1/s1key: ofkrkchcywqzly-xhbswpgzbs smiles o=c2n1/c(=c(\cs12nc(=o)(c3cccc(ns(=o)(=o)c)c3)n)c)c(=o)o properties chemical formula c17h20n4o6s2 molar mass 440.49 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references