6-hydroxy-7-oxo-cyclohepta-1,3,5-triene-1,2-dicarboxylic acid-anhydride

1,1,4-trimethylcycloheptane

2,3,5-trimethyl-1,4-naphthoquinone

(+/-)-2r-butyl-1,1,3c-trimethyl-cyclohexane

1,6-dimethyl-5,6,7,8-tetrahydronaphthalene