5,8-dihydro-2,3,6,7-tetramethylnaphthalene

2,3,6,7-tetramethyl-naphthalene-1,4-dicarbonitrile

2,3,6,7-tetramethyl-4a,5,8,8a-tetrahydro-1,4-naphthoquinone

2,3,6,7-tetramethyl-1,2,3,4,4a,5,8,8a-octahydronaphthalene

1,4,5,8,8a-hexahydro-1,4-dihydroxy-2,3,6,7-tetramethylnaphthalene