2-(4-(tert-Butoxycarbonyl)-2-oxopiperazin-1-yl)acetic acid
4-(tert-Butoxycarbonyl)-6-oxopiperazine-2-carboxylic acid
1-Boc-3-Oxopiperazine
1-tert-Butyl 3-methyl 5-oxopiperazine-1,3-dicarboxylate
1-(tert-Butoxycarbonyl)-5-oxopiperazine-2-carboxylic acid
tert-Butyl 4-(2-aminoethyl)-3-oxopiperazine-1-carboxylate
(S)-1-(tert-Butoxycarbonyl)-5-oxopiperazine-2-carboxylic acid
