1,2-bis(bromomethyl)-3,3,6,6-tetramethylcyclohexene

2,2,9-trimethyl-3,4-dihydropyrano[3,2-c]chromen-5-one

2,2,7-trimethyl-3,4-dihydropyrano[3,2-c]chromen-5-one

2,2-dimethylpyrano[3,2-c]chromen-5-one

2,2,9-trimethylpyrano[3,2-c]chromen-5-one