L-Phenylalanine, N,N'-(((2-(2-amino-6-(cyclopropylamino)-9H-purin-9-YL)ethoxy)methyl)-phosphinylidene)bis-, bis(2-methylpropyl) ester
GS-9191 is under investigation in clinical trial NCT00499967 (Safety and Effectiveness Study of an Experimental Topical Ointment (GS-9191) for the Treatment of Genital Warts).