AIDS-005377 AIDS005377 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.-beta.-]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]bis[N-(2-pyridinylmethyl)-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-2-thiazolidineacetamide]