3-[2-(2-{2-[(2-Benzyl-3-phenyl-propionyl)-methyl-amino]-3-methyl-butyrylamino}-3,3-dimethyl-butyrylamino)-4-oxo-4-pyrrolidin-1-yl-butyrylamino]-N-(1-hydroxymethyl-3,3-dimethyl-butyl)-succinamic acid AIDS-188199 AIDS188199