... asthma, stimulate the sensory nerve, blood vessel expansion.. [English name]: Icariin[CAS NO.]: 489-32-7[Formula]: C33H40O15[Molecular Weight ... ]: 676.65[Structural Formula]:[Specification]: 10%,20%,50%,98%[Test method]: HPLC[Product properties]: Brown powder ... → Solvent extraction → Concentration → Chromatography isolation→ Crystallization→ Icariin. Icariin 10%,20%,50%,98%