AIDS-005395 AIDS005395 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.-beta.-]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]bis[5,5-dimethyl-.alpha.-[(2-phenoxybenzoyl)amino]-2-thiazolidineacetic acid, methyl ester]