7-(cyclopentyloxy)-2,2-dimethyl-2,3-dihydro-4H-chromen-4-one

7-methanesulfonyloxy-2,2-dimethyl-chroman-4-one

2,2-dimethyl-4-keto-7-tosyloxy-benzopyran

7-甲氧基-2,2-二甲基苯并二氢吡喃-4-酮

N-formamido-3-methyl-2-butenamide