(S)-N,N'-bis(p-methoxybenzyl)-3-methylene-6-isopropylpiperazine-2,5-dione

(3S)-(6,6-2H2)-3,6-dihydro-2,5-dimethoxy-3-(1-methylethyl)pyrazine

(S)-2,5-二氢-3,6-二甲氧基-2-异丙基吡嗪

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

(3S)-N-1-(tert-butoxycarbonyl)-N-4-(4-methoxybenzyl)-3-isopropyl-piperazine-2,5-dione