tert-butyl ((3S,4S)-1-(3-(5-((tert-butoxycarbonyl)amino)-2-(2,6-difluorophenyl)thiazole-4-carboxamido)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl)-4-((tert-butyldimethylsilyl)oxy)piperidin-3-yl)carbamate

tert-butyl (3aS,7aR)-5-(3-amino-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl)-2-oxohexahydro[1,3]oxazolo[4,5-c]pyridine-3(2H)-carboxylate

tert-butyl (3S,4S)-(3,4-trans-4-{[tert-butyl(dimethyl)silyl]oxy}piperidin-3-yl)carbamate

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

tert-butyl ((3S,4S)-4-((tert-butyldimethylsilyl)oxy)-1-(3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl)piperidin-3-yl)carbamate