5,7-二羟基-2,2-二甲基-2,3-二氢-4H-苯并吡喃-4-酮

3,3-二甲基丙烯酸

γ,γ-di-p-tolyl-γ-butyrolactone

3,4-Dihydro-7-hydroxy-5-methoxy-2,2-dimethyl-2H-1-benzopyran

Toluene-4-sulfonic acid 5-methoxy-2,2-dimethyl-chroman-7-yl ester