The molecule is a flavonoid oxonion resulting from the deprotonation of the hydroxy group at position 7 of the flavone moiety of afzelin (kaempferol 3-O-alpha-L-rhamnoside). The major species at pH 7.3. It is a conjugate base of an afzelin.
7-hydroxy-2-(4-hydroxyphenyl)-4-oxo-3-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxychromen-5-olate