benzyl (3R,4R,5S)-3-[(tert-butoxycarbonyl)amino]-4-{[tert-butyl(dimethyl)silyl]oxy}-5-methylpiperidine-1-carboxylate

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

2-(2-fluoro-4-iodopyridin-3-yl)ethanol

4-iodo-5-nitro-2,3-dihydrofuro[2,3-b]pyridine