Table 2.

Selected quercetin derivatives alongside the position of the modification (see Figure 1 for correspondent numbers of the carbon atoms).

Selected Quercetin Derivative	Chemical Structure	Modification on A-Ring	Modification on B-Ring	Modification on C-Ring
Quercetin		-	-	3-OH to 3-O- glucoside
3-O-glucoside
(Isoquercetin)
Quercetin		-	-	3-OH to 3-O- galactoside
3-O-galactoside
(Hyperoside)
Quercetin		-	-	3-OH to 3-O- rhamnoside
3-O-rhamnoside
(Quercitrin)
Quercetin		7-OH to 7-O-glucoside	-	-
7-O-glucoside
(Quercimeritrin)
Quercetin		-	-	3-OH to 3-O- rutinoside
3-O-rutinoside
(Rutin)
Quercetin		-	3′-OH to 3′-methyl ether	-
3-methyl ether
(Isorhamnetin)
Isorhamnetin		-	3′-OH to 3′-methyl ether 4′-OH to 4′-O-glucoside	3-OH to 3-O- rutinoside
3-O-rutinoside-
4′-O-glucoside
Isorhamnetin		7-OH to 7-O-glucoside	3′-OH to 3′-methyl ether	3-OH to 3-O- rutinoside
3-O-rutinoside-
7-O-glucoside
Quercetin		-	3′-OH to 3′-methyl ether	3-OH to 3-methyl ether
3,3′-dimethyl ether
Quercetin		-	4′-OH to 4′-O-glucoside	-
4′-O-glucoside
(Spiraeoside)
Quercetin		7-OH to 7-O-rhamnoside	-	-
7-O-rhamnoside
Quercetin		7-OH to 7-O-rhamnoside	-	3-OH to 3-O- glucoside
3-O-glucoside-
7-O-rhamnoside
(VincetoxicosideA)
4′-O-methyl		-	4′-OH to 4′- methyl ether	-
quercetin
(Tamarixetin)
7-O-methyl		7-OH to 7-methyl ether	-	-
quercetin
(Rhamnetin)
3′, 7-dimethyl quercetin		7-OH to 7-methyl ether	3′-OH to 3′-methyl ether	-
(Rhamnazin)

Chemical structure source: PubChem [41].