(2RS,4S)-2-{(1R)-2-(benzylamino)-2-oxo-1-[(phenylacetyl)amino]ethyl}-N-[(1R)-1-benzyl-2-hydroxyethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxamide AIDS-005470 AIDS005470 Penicillin deriv.