3-(3-amino-6-(2,6-difluorophenyl)pyrazine-2-carboxamido)-4-((S)-3-((tert-butoxycarbonyl)amino)piperidin-1-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-7-yl acetate

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

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

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