Quercetin Dihydrate: CAS No. 6151-25-3 Specification:98%UV Molecular ... ,4,5,7-pentahydroxy-2-phenyl-4H-chromen-4-one; Quercetin hydrate; Quercetin 3,3,4,5,7-Pentahydroxy-flavone dihydrate; 3 ... ,3,4,5,7-Pentahydroxyflavone; QUERCETINE; Assay Quercetin is not less than 98% in dried substance by UV ...