AIDS-005460 AIDS005460 Penicillin Et(NH)2 dimer [2R-[2.alpha.(R*),4.beta.(S*)]-N-Ethyl-5,5-dimethyl-4-[[[2-[[(5,5-dimethyl-4-thiazolidinyl)carbonyl]amino]ethyl]amino]carbonyl]-.alpha.-[(phenylacetyl)amino]-2-thiazolidineacetamide