(1β,4β)-3,3-Dimethylspiro[bicyclo[2.2.1]heptane-2,1'-cyclobutan]-3'-one
(1β,4β)-3,3-Dimethylspiro[bicyclo[2.2.1]heptane-2,1'-cyclobutan]-3'-one ??
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(1β,4β)-3,3-Dimethylspiro[bicyclo[2.2.1]heptane-2,1'-cyclobutan]-3'-one C??? ??, ??, ??
(1β,4β)-3,3-Dimethylspiro[bicyclo[2.2.1]heptane-2,1'-cyclobutan]-3'-one ?? ?? ? ???
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(1β,4β)-3,3-Dimethylspiro[bicyclo[2.2.1]heptane-2,1'-cyclobutan]-3'-one ?? ??
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