rac-2-((1R,4S,5R)-5,8,8-trimethylspiro[bicyclo[3.2.1]octane-2,2'-[1,3]dioxolan]-4-yl)acetonitrile

(5,8,8-Trimethyl-4-oxo-bicyclo[3.2.1]oct-2-en-2-yl)-acetonitrile

(1,8,8-Trimethyl-4-oxo-bicyclo[3.2.1]oct-2-en-2-yl)-acetonitrile

[4-Cyclohexyloxy-1,8,8-trimethyl-bicyclo[3.2.1]oct-3-en-(2E)-ylidene]-acetonitrile