5-Isobutyl-1-methoxymethoxy-3-[2-methyl-prop-(Z)-ylidene]-3H-pyrazine-2,6-dione

L-亮氨酸甲酯盐酸盐

N-(1-tert-butoxy-acet-2-yl)-(S)-leucine methyl ester

(S)-1-Hydroxy-3-isobutyl-4-(4-methoxy-benzyl)-piperazine-2,6-dione

N-p-methoxybenzyl-N-carboxymethyl-(S)-leucine methyl ester