147229-92-3 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-1-benzopyran-4-one phosphate potassium salt 4H-1-Benzopyran-4-one, 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-, phosphate, potassium salt PQP Potassium quercetin phosphate