pheneticillin pheneticillin pheneticillin (or phenethicillin) is a penicillin. it is not approved by the fda for use in the united states. pheneticillinclinical dataahfs/drugs.cominternational drug namesatc codej01ce05 (who) identifiers iupac name (2s,5r,6r)-3,3-dimethyl-7-oxo-6--4-thia-1-azabicycloheptane-2-carboxylic acid cas number147-55-7 ypubchem cid272833chemspider240055 nuniiefa30x554hkeggd08350 ychemblchembl1614637 ncomptox dashboard (epa)dtxsid6023448 echa infocard100.005.175 chemical and physical dataformulac17h20n2o5smolar mass364.42 g·mol−13d model (jsmol)interactive image smiles cc(c(=o)n12n(c1=o)(c(s2)(c)c)c(=o)o)oc3=cc=cc=c3 inchi inchi=1s/c17h20n2o5s/c1-9(24-10-7-5-4-6-8-10)13(20)18-11-14(21)19-12(16(22)23)17(2,3)25-15(11)19/h4-9,11-12,15h,1-3h3,(h,18,20)(h,22,23)/t9?,11-,12+,15-/m1/s1 nkey:nonjjlvghlvqqm-jhxyumngsa-n n ny (what is this?) (verify)