AIDS-004965 AIDS004965 Penicillin Pr(NH)2 dimer [2R-[2a(R*),4.beta.]]-4,4'-[1,3-Propanediylbis(aminocarbonyl)]bis[N-ethyl-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-2-thiazolidineacetamide]