... -7[Formula]: C33H40O15[Molecular Weight]: 676.65[Structural Formula]:[Specification]: 10%,20%,50%,98%[Test method]: HPLC[Product properties]: Brown powder ... flow]: Epimedium → Solvent extraction → Concentration → Chromatography isolation→ Crystallization→ Icariin. Icariin 10%,20%,50%,98%