is conjugate base of quercetin quercetin-7-olate -1 2-(3,4-dihydroxyphenyl)-3,5-dihydroxy-4-oxo-4-chromen-7-olate 301.035 301.22830 C15H9O7 CHEBI:57694 Conjugate base of quercetin arising from selective deprotonation of the 7-hydroxy group; major species at pH 7.3. InChI=1S/C15H10O7/c16-7-4-10(19)12-11(5-7)22-15(14(21)13(12)20)6-1-2-8(17)9(18)3-6/h1-5,16-19,21H/p-1 Oc1ccc(cc1O)-c1oc2cc([O-])cc(O)c2c(=O)c1O REFJWTPEDVJJIY-UHFFFAOYSA-M chebi_ontology quercetin quercetin anion flavonol oxoanion