AIDS-005396 AIDS005396 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediyl]bis[aminocarbonyl]bis[N-ethyl-5,5-dimethyl-.alpha.-[2-(phenylamino)benzoylamino]-2-thiazolidineacetamide]