The molecule is a flavonoid oxoanion resulting from the deprotonation of the hydroxy groups at positions 5 and 7 of the flavonoid moiety of quercetin 3-O-[(6-O-caffeoyl-beta-D-glucosyl)-(1->2)-beta-D-glucoside]. Identified in Fig. S20, peak 1 It is a conjugate base of a quercetin 3-O-[(6-O-caffeoyl-beta-D-glucosyl)-(1->2)-beta-D-glucoside].
3-[(2S,3R,4S,5S,6R)-3-[(2S,3R,4S,5S,6R)-6-[[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-7-hydroxy-2-(3-hydroxy-4-oxidophenyl)-4-oxochromen-5-olate