AIDS-005392 AIDS005392 C2-sym dimer Penicillin deriv. [2R-[2.alpha.(R*),4.beta.]]-4,4'-[1,2-Ethanediylbis(aminocarbonyl)]bis[N-ethyl-5,5-dimethyl-.alpha.-[[(5-methyl-3-phenyl-4-isoxazolyl)carbonyl]amino]-2-thiazolidineacetamide]