“…There are over 9000 flavonoids have been identified and grouped into six distinct subclasses according to their basic structure, flavones, flavonols, isoflavones, chalcones, anthocyanidins, and aurones [ 29 , 30 ]. Some kinds of flavonoids have been reported to activate ERα, such as apigenin, naringenin, daidzein, chalcone, and pelargonidin [ [31] , [32] , [33] , [34] ]. However, they belong to different kinds of flavonoids, and their capabilities binding to ERα are unknown [ 35 ].…”