3,3-二甲基丙烯酸

2,2-dimethyl-3,4-dihydro-2H-chromene-5,7-diol

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