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

4-{(3R,5S)-3-[(tert-butoxycarbonyl)amino]-4-hydroxy-4,5-dimethylpiperidin-1-yl}-3-({[6-(2,6-difluorophenyl)-5-fluoropyridin-2-yl]carbonyl}amino)-6,7-dihydro-5H-cyclopenta[b]pyridin-7-yl acetate

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

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

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