4-[(2-{(1R)(2-phenylacetylamino)[N-benzylcarbamoyl]methyl}(4S)-5,5-dimethyl(1,3-thiazolidin-4-yl))carbonylamino](3R,4R)-3-hydroxy-N-(2-hydroxyethyl)-5-phenylpentanamide AIDS-005495 AIDS005495 Penicillin deriv.