benzyl (3S,4S)-3-((tert-butoxycarbonyl)amino)-4-((methylsulfonyl)oxy)piperidine-1-carboxylate

5-benzyl 3-(tert-butyl) (3aS,7aR)-2-oxotetrahydrooxazolo[4,5-c]pyridine-3,5(2H,4H)-dicarboxylate

benzyl (3S,4S)-3,4-trans-3-[(tert-butoxycarbonyl)amino]-4-hydroxypiperidine-1-carboxylate

4-chloro-3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridine