| http://www.w3.org/ns/prov#value | - In the present invention, all the parts thereof includingroots, leaves, stems and the like can be used as the starting material.For isolation and purification, the starting material is firstly extracted with an alcohol such as methanol, ethanol, n-propanol, iso-propanol or the like, or a solvent such as acetone, ethyl acetate, acetonitrile or the like.
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