AIDS-005400 AIDS005400 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]bis[N-(2,4-dichlorobenzyl)-5,5-dimethyl-.alpha.-[(2-pyridinylacetyl)amino]-2-thiazolidineacetamide]