Table 2.

Structures of flavonoids [25].

Compound	3	5		6		7			8		3′		4′		5′		C-2−C-3
Quercetin (1)	OH	OH		H		OH			H		OH		OH		H		double
Luteolin (2)	H	OH		H		OH			H		OH		OH		H		double
Myricetin (3)	OH	OH		H		OH			H		OH		OH		OH		double
Kaempferol (4)	OH	OH		H		OH			H		H		OH		H		double
Chrysin (5)	H	OH		H		OH			H		H		H		H		double
Genkwanin (6)	H	OH		H		OCH3			H		H		OH		H		double
Apigenin (7)	H	OH		H		OH			H		H		OH		H		double
4′,5,6-Trihydroxy-7-methoxyflavone (8)	H	OH		OH		OCH3			H		H		OH		H		single
5,6-Dihydroxy-4′,7-dimethoxyflavone (9)	H	OH		OH		OCH3			H		H		OCH3		H		single
5,6-Dihydroxy-3′,4′,7-trimethoxyflavone (10)	H	OH		OH		OCH3			H		OCH3		OCH3		H		single
4′,5,6-Trihydroxy-7,8-dimethoxyflavone (11)	H	OH		OH		OCH3			OCH3		H		OH		H		single
Naringenin (12)	H	OH		H		OH			H		H		OH		H		single
Eriodictyol (13)	H	OH		H		OH			H		OH		OH		H		single
Aromadendrin (14)	OH	OH		H		OH			H		H		OH		H		single
Taxifolin (15)	OH	OH		H		OH			H		OH		OH		H		single
Tamarixetin (16)	OH	OH		H		OH			H		OH		OCH3		H		double
3′,4′,5,7-Tetrahydroxy-3-methoxyflavone (17)	OCH3	OH		H		OH			H		OH		OH		H		double
3′,5,7-Trihydroxy-3,4′-dimethoxyflavone (18)	OCH3	OH		H		OH			H		H		OCH3		H		double
3,5,7-Trihydroxy-3′,4′,5′-trimethoxyflavone (19)	OH	OH		H		OH			H		OCH3		OCH3		OCH3		double