Delphinidin-3-glucoside Cyanidin-3-glucoside Petunidin-3-glucoside Peonidin-3-glucoside Malvidin-3-glucoside Malvidin-3-p-coumaroyl-glucoside R1 -OH -OH -OCH3 -OCH3 -OCH3 -OCH3 R2 -OH -H -OH -H - OCH3 -OCH3

Table 2: Structure of anthocyanin-3-O-glucoside.