5-Isoxazoleacetic acid, .alpha.-amino-3-chloro-4,5-dihydro-4-hydroxy- 5-Isoxazoleacetic acid, .alpha.-amino-3-chloro-4,5-dihydro-4-hydroxy-, (4R-(4.alpha.,5.beta.(S*)))- 5-isoxazolecetic Acid, .alpha.-amino-3-chloro-4,5-dihydro-4-hydrxoxy-, [4R-[4.alpha.,5.beta.(S*)]]- Hydroxy AT 125 NSC176324