AIDS-005386 AIDS005386 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediyl]bis[aminocarbonyl]-bis[N-ethyl-5,5-dimethyl-.alpha.-[(2-naphthylacetyl)amino]-2-thiazolidineacetamide]