ethyl 2,2-dimethylchroman-6-carboxylate

2,2-二甲基苯并二氢吡喃-8-羧酸

2,2-二甲基香豆素-6-甲醛

2-(2,2-dimethyl-3,4-dihydrochromen-6-yl)acetonitrile

(2,2-dimethyl-3,4-dihydrochromen-6-yl)methanol