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

benzyl (3R,4S,5S)-3-[(tert-butoxycarbonyl)amino]-4-hydroxy-4,5-dimethylpiperidine-1-carboxylate

tert-butyl [(3R,4S,5S)-4-hydroxy-4,5-dimethyl-1-(5-nitro-2,3-dihydrofuro[2,3-b]pyridin-4-yl)piperidin-3-yl]carbamate

5-amino-N-{4-[(3R,4S,5S)-3-amino-4-hydroxy-4,5-dimethylpiperidin-1-yl]-2,3-dihydrofuro[2,3-b]pyridin-5-yl}-2-(2,6-difluorophenyl)-1,3-thiazole-4-carboxamide

tert-butyl [(3R,4R,5S)-4-hydroxy-4,5-dimethyl-1-(5-nitro-2,3-dihydrofuro[2,3-b]pyridin-4-yl)piperidin-3-yl]carbamate