fosdevirine fosdevirine fosdevirine is an experimental antiviral agent of the non-nucleoside reverse transcriptase inhibitor class that was studied for potential use in the treatment of hiv-aids. fosdevirineclinical dataother namesgsk2248761; gsk2248761a; idx-12899; idx-899atc codenoneidentifiers iupac name 5-chloro-3--5-methylphenyl]-methoxyphosphoryl]-1h-indole-2-carboxamide cas number1018450-26-4pubchem cid44232529chemspider28529638uniiz4i0c281bjkeggd09906chemblchembl2104968chemical and physical dataformulac20h17cln3o3pmolar mass413.80 g·mol−13d model (jsmol)interactive image smiles cc1=cc(=cc(=c1)/c=c/c#n)(=o)(c2=c(nc3=c2c=c(c=c3)cl)c(=o)n)oc inchi inchi=1s/c20h17cln3o3p/c1-12-8-13(4-3-7-22)10-15(9-12)28(26,27-2)19-16-11-14(21)5-6-17(16)24-18(19)20(23)25/h3-6,8-11,24h,1-2h3,(h2,23,25)/b4-3+/t28-/m1/s1key:cgbytkoszyqopv-assbyyiwsa-n it was discovered by idenix pharmaceuticals and was being developed by glaxosmithkline and viiv healthcare, but it has now been discontinued due to unexpected side effects.