Toluene-4-sulfonic acid (2S,3S)-2,3-bis-methoxymethoxy-3-[(S)-1-(2-nitro-benzenesulfonyl)-1,2,5,6-tetrahydro-pyridin-2-yl]-propyl ester

(2S)-(1'S,2'S)-3'-hydroxy-[1',2'-(isopropylidenedioxy)propyl]-N-(2-nitrobenzenesulfonyl)-3,4-dehydro-piperidine

(1S,2S,8aS)-1,2-Bis(methoxymethoxy)indolizidine

(1S,2S,8aS)-1,2-bis(methoxymethoxy)-1,2,3,5,6,8a-hexahydro-indolizine

(2S)-{(1'S,2'S)-1',2'-(isopropylidenedioxy)-3'-[(p-toluenesulfonyl)oxy]propyl}-N-(2-nitrobenzenesulfonyl)-3,4-dehydro-piperidine