AIDS-005461 AIDS005461 Penicillin Et(NH)2 dimer [2S-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]-bis[N-ethyl-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-2-thiazolidineacetamide]