6-(dibenzoylamino)-9-(7,7-dimethyl-6,8-dioxaspiro<3.5>non-2-yl)-9H-purine
6-<6-(dibenzoylamino)-9H-purin-9-yl>cyclobutane-1,1-dimethanol
6-(benzoylamino)-9-(7,7-dimethyl-6,8-dioxaspiro<3.5>non-2-yl)-9H-purine
2-(benzyloxy)-7,7-dimethyl-6,8-dioxaspiro<3.5>nonane
7,7-dimethyl-6,8-dioxaspiro<3.5>nonan-2-ol