1-O-benzyl 2-O-methyl (2S)-5-oxopiperidine-1,2-dicarboxylate

1-Benzyl 2-methyl (2S)-5-oxo-1,2-pyrrolidinedicarboxylate

2-[1-(4-chlorophenyl)-4,5,6,7-tetrahydroindazol-3-yl]acetic acid

methyl (S)-2-benzyloxycarbonylamino-6-diazo-5-oxohexanoate

(S)-(S)-4-(((benzyloxy)carbonyl)amino)-5-methoxy-5-oxopentanoic (isobutyl carbonic) anhydride