(6S,3S,1'R)-N-1-(4-methoxybenzyl)-N-4-(tert-butoxycarbonyl)-3-(1-hydroxy-2-methylpropyl)-6-isopropyl-piperazine-2,5-dione

(6S,3E)-3-isobutylidene-6-isopropyl-1,4-bis-(4-methoxybenzyl)piperazine-2,5-dione

(6S,3Z)-N,N'-bis-(4-methoxybenzyl)-3-isobutylidene-6-isopropyl-piperazine-2,5-dione

[(2S,5S)-N,N'-bis-(4-methoxybenzyl)-5-isopropyl-3,6-dioxopiperazin-2-yl]-phosphonic acid diethyl ester

(R)-N,N’-双对甲氧苄基-3-异丙基哌嗪-2,5-二酮