Figure 3
Chemical structure of 3 types of curcuminoids. A: Curcumin; IUPAC name: (E, E) -1, 7-bis (4-Hydroxy-3-methoxyphenyl) -1,6-heptadiene-3,5-dione. B: Demethoxycurcumin; IUPAC name: (1E, 6E) -1- (4-hydroxy-3-methoxyphenyl) -7- (4-hydroxyphenyl) hepta-1, 6- diene-3, 5-dione. C: Bisdemethoxycurcumin; IUPAC name: (E, E) -1, 7-Bis (4-hydroxyphenyl) -1, 6-heptadiene-3, 5-dione (Yang et al., 2015)