AIDS-005552 AIDS005552 N,N'-1,2-Ethanediylbis[3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]-4-thia-1-azabicyclo[3.20]heptane-2-carboxamide, [2S-[2.alpha.(2'R*,5'S*,6'S*), 5.alpha., 6.beta.]] Penicillin ET(NH)2 Sym dimer