ethyl-(3S,6R)-3-isopropyl-2,5-dimethoxy-3,6-dihydropyrazin-6-yl-acetate

(3S,6R)-6-(2'-tosyloxyethyl)-3-isopropyl-2,5-dimethoxy-3,6-dihydropyrazine

乙基缬氨酸酯

N-Boc-L-缬氨酸

3-异丁基-6-甲基-2,5-哌嗪二酮