40827-30-3;Dispiro[cyclopropane-1,2'-bicyclo[2.2.2]octane-3',1"-cyclopropane];Dispiro[cyclopropane-1,2'-bicyclo[2.2.2]octane-3',1''-cyclopropane;Dispiro(cyclopropane-1,2'-bicyclo(2.2.2)octane-3',1''-cyclopropane)