(S)-methyl 2-((2-(hydroxyamino)-2-oxoethyl)(4-methoxybenzyl)amino)-4-methylpentanoate

1-methoxymethoxy-3S-isobutyl-4-p-methoxybenzylpiperazine-2,6-dione

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

(S)-2-[(2,5-Dioxo-pyrrolidin-1-yloxycarbonylmethyl)-(4-methoxy-benzyl)-amino]-4-methyl-pentanoic acid methyl ester

Methanesulfonic acid (R)-1-[(2S,6S)-6-isobutyl-1-(4-methoxy-benzyl)-4-methoxymethoxy-3,5-dioxo-piperazin-2-yl]-2-methyl-propyl ester