AIDS-005370 AIDS005370 C2-sym dimer Penicillin Et(NH)2 dimer Penicillin deriv. [2R-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediylbis[aminocarbonyl]]bis[N-(2,2,2-trifluoroethyl-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-2-thiazolidineacetamide]