(2RS,4S)-2-{(1R)-2-(benzylamino)-2-oxo-1-[(phenylacetyl)amino]ethyl}-N-[(1S)-1-benzyl-2-hydroxyethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxamide AIDS-005469 AIDS005469 Penicillin deriv.