AIDS-005389 AIDS005389 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]bis[N-ethyl-5,5-dimethyl-.alpha.-(benzylsulfonamido)-2-thiazolidineacetamide]