(Isoxazolin-5-on-2-yl)alanine (S)-alpha-Amino-5-oxo-2(5H)-isoxazolepropanoic acid 2(5H)-Isoxazolepropanoic acid, alpha-amino-5-oxo-, (S)- 59476-61-8 BIOYA beta-(Isoxazolin-5-on-2-yl)alanine