4-[(2-{(1R)(2-Phenylacetylamino)[N-benzylcarbamoyl]methyl}(4S)-5,5-dimethyl(1,3-thiazolidin-4-yl))carbonylamino](3R,4R)-3-hydroxy-5-phenyl-N-benzylpentanamide AIDS-005487 AIDS005487 Penicillin deriv.