4-[(2-{(1R)(2-Phenylacetylamino)[N-benzylcarbamoyl]methyl}(4S)-5,5-dimethyl(1,3-thiazolidin-4-yl))carbonylamino](3R,4R)-3-hydroxy-N-(2-imidazol-2-ylethyl)-5-phenylpentanamide AIDS-005494 AIDS005494 Penicillin deriv.