1,4-dimethyl-3-[p-(3-methyl-2-butenyl)oxy]benzyl-2,5-piperazinedione

甲醛

L-酪氨酸甲酯

N-甲基-L-苯丙氨酸

N,O-dimethyl-N-(toluene-4-sulfonyl)-L-tyrosine