5-Hydroxy-3',4',6,7-tetramethoxyflavone (CAS: 21763-80-4) is a naturally derived polymethoxylated flavone commonly found in citrus-related botanical sources. With ≥98% HPLC purity, this compound is widely used as a research-grade flavonoid reference for phytochemical analysis, chromatographic method development, and early-stage formulation research.   Supplied with complete documentation including COA, HPLC chromatogram, MS, and NMR data.For laboratory and R&D use only.