trans-2,3,4,5-tetramethyl-2-cyclopentenone

bis(pentamethylcyclopentadienyl)silicon

3,5-dimethyl-hepta-2,5-dien-4-one

7-(1,2,3,4,5-pentamethylcyclopenta-2,4-dien-1-yl)cyclohepta-1,3,5-triene