AIDS-005390 AIDS005390 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.-[(4-hydroxyphenyl)acetylamino]-2-thiazolidineacetamide]