N-carbamyl (R)-2-amino-4-phenylbutyric acid

2-羟基-4-苯基丁酸

(R)-2-羟基-4-苯基丁酸乙酯

(E)-2-oxo-4-phenyl-3-butenoic acid

2-oxo-4-phenylbut-3-enoic acid 2-isopropyl-5-methylcyclohexyl ester