6-chloro-9-<3,3-bis(benzyloxymethyl)cyclobut-1-yl>-9H-purine
5-amino-6-chloro-4-<<3,3-bis(benzyloxymethyl)cyclobut-1-yl>amino>pyrimidine
3,3-bis(benzyloxymethyl)cyclobutanone oxime
3,3-dimethoxy-1,1-bis(benzyloxymethyl)cyclobutane
3,3-bis(benzyloxymethyl)cyclobutanone