4-[[[3-[4-[[(1,1-Dimethylethyl)amino]carbonyl]-2,2,5,5-tetramethyl-3-thiazolidinyl]-2(R)-hydroxypropyl]amino]carbonyl]-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-N-(phenylmethyl)-2- AIDS-006804 AIDS006804 Penicillin, 3Thiazol-OHPrNH2 analog