virginiamycin s1 virginiamycin s1 virginiamycin s1 is a macrolide antibiotic in the group of antibiotics known as streptogramin b. virginiamycin s1 names systematic iupac name n-pyrrolo oxapentaazacyclononadecin-9-yl]-3-hydroxypyridine-2-carboxamide identifiers cas number 23152-29-6 y 3d model (jsmol) interactive image chebi chebi:46416 n chemspider 4534976 n echa infocard 100.041.314 pubchem cid 5388936 unii j91d5gn5at y comptox dashboard (epa) dtxsid0046856 inchi inchi=1s/c43h49n7o10/c1-4-29-40(56)49-21-12-17-30(49)41(57)48(3)32(23-26-13-7-5-8-14-26)42(58)50-22-19-28(51)24-31(50)37(53)47-35(27-15-9-6-10-16-27)43(59)60-25(2)34(38(54)45-29)46-39(55)36-33(52)18-11-20-44-36/h5-11,13-16,18,20,25,29-32,34-35,52h,4,12,17,19,21-24h2,1-3h3,(h,45,54)(h,46,55)(h,47,53)/t25-,29-,30+,31+,32+,34+,35+/m1/s1 nkey: fepmhvlsldomqc-iypflvaksa-n ninchi=1/c43h49n7o10/c1-4-29-40(56)49-21-12-17-30(49)41(57)48(3)32(23-26-13-7-5-8-14-26)42(58)50-22-19-28(51)24-31(50)37(53)47-35(27-15-9-6-10-16-27)43(59)60-25(2)34(38(54)45-29)46-39(55)36-33(52)18-11-20-44-36/h5-11,13-16,18,20,25,29-32,34-35,52h,4,12,17,19,21-24h2,1-3h3,(h,45,54)(h,46,55)(h,47,53)/t25-,29-,30+,31+,32+,34+,35+/m1/s1key: fepmhvlsldomqc-iypflvakbh smiles o=c((cc2=cc=cc=c2)n(c)(6n(ccc6)c5=o)=o)n1((n(c(o(c)(c(n5cc)=o)nc(c4=nc=cc=c4o)=o)=o)3=cc=cc=c3)=o)cc(cc1)=o properties chemical formula c43h49n7o10 molar mass 823.904 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references