4-[[[3-[3-[[(1,1-Dimethylethyl)amino]carbonyl]decahydro-2-isoquinolinyl]-2-hydroxypropyl]amino]carbonyl]-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-N-heptyl-2-thiazolidineacetic acid, [2R-[2.alpha. AIDS-006818 AIDS006818 Penicillin, 2Isoquin-OHPrNH2 analog