6-(dibenzoylamino)-9-(7,7-dimethyl-6,8-dioxaspiro<3.5>non-2-yl)-9H-purine
9-(7,7-dimethyl-6,8-dioxaspiro<3.5>non-2-yl)-9H-purin-6-amine
7,7-dimethyl-6,8-dioxaspiro<3.5>non-2-yl 4-bromobenzenesulfonate
2-(benzyloxy)-7,7-dimethyl-6,8-dioxaspiro<3.5>nonane
7,7-dimethyl-6,8-dioxaspiro<3.5>nonan-2-ol