{6-[(3aS,4S,6R,6aR)-6-(6-Amino-purin-9-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethylsulfanyl]-8-azido-octyl}-(3-azido-propyl)-carbamic acid 4-nitro-benzyl ester
{6-[(3aS,4S,6R,6aR)-6-(6-Amino-purin-9-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethylsulfanyl]-octyl}-propyl-carbamic acid benzyl ester