flopristin flopristin flopristin is a semi-synthetic antibiotic of the streptogramin a class. it is a fluorinated derivative of pristinamycin iib. flopristin names iupac name (7r,10r,11r,12z,17z,19z,21s,23r)-23-fluoro-21-hydroxy-11,19-dimethyl-10-propan-2-yl-9,26-dioxa-3,15,28-triazatricyclooctacosa-1(27),12,17,19,25(28)-pentaene-2,8,14-trione other names (16r)-16-desoxy-16-fluoropristinamycin iib; rpr 132552; rpr 132552a identifiers cas number 318498-76-9 y 3d model (jsmol) interactive image chemspider 8090642 echa infocard 100.218.104 ec number 690-752-1 pubchem cid 21944122 unii ozv2qpb39m comptox dashboard (epa) dtxsid40953763 inchi inchi=1s/c28h38fn3o6/c1-17(2)26-19(4)9-10-24(34)30-11-5-7-18(3)13-21(33)14-20(29)15-25-31-22(16-37-25)27(35)32-12-6-8-23(32)28(36)38-26/h5,7,9-10,13,16-17,19-21,23,26,33h,6,8,11-12,14-15h2,1-4h3,(h,30,34)/b7-5-,10-9-,18-13-/t19-,20-,21-,23-,26-/m1/s1key: dfsjqgclwzvmod-zitbljmasa-n smiles o(/c=c(c)/c=c/cnc(/c=c/(c)(oc1=o)c(c)c)=o)c(f)cc2=nc(c(n31ccc3)=o)=co2 properties chemical formula c28h38fn3o6 molar mass 531.625 g·mol−1 hazards ghs labelling: pictograms signal word warning hazard statements h302, h312, h317, h332, h341 precautionary statements p201, p202, p261, p264, p270, p271, p272, p280, p281, p301+p312, p302+p352, p304+p312, p304+p340, p308+p313, p312, p321, p322, p330, p333+p313, p363, p405, p501 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references flopristin is one of the components of the experimental drug nxl103.