(2R)-2-(4-{N-[(1R,2R)-3-Carbamoyl-2-hydroxy-1-benzylpropyl]carbamoyl}(4S)-5,5-dimethyl(1,3-thiazolidin-2-yl))-2-(2-phenylacetylamino)-N-benzylacetamide AIDS-005483 AIDS005483 Penicillin deriv.