(2R,3R,4S)-5-azido-2 [(tert-butoxycarbonyl)amino]-3-{[tert-butyl(dimethyl)silyl]oxy}-4-methylpentyl methanesulfonate

tert-butyl ((3R,4R,5S)-4-{[tert-butyl(dimethyl)silyl]oxy}-5-methylpiperidin-3-yl)carbamate

tert-butyl [(3R,4R,5S)-4-{[tert-butyl(dimethyl)silyl]oxy}-5-methyl-1-(3-nitropyridin-4-yl)piperidin-3-yl]carbamate