AIDS-005462 AIDS005462 Penicillin Et(NH)2 dimer [2R-[2.alpha.(S*),4.beta.]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]-bis[N-ethyl-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-2-thiazolidineacetamide]