Plant source:The dry root of Astragalus membranaceus (Fisch. )Bge.(Main origin of Gansu) or Astragalus membranaceus (Fisch. ) Bge. var. mongholicus ( Bge. ) Hsiao(Main origin of Inner Mongolia) Appearance: White powder Molecular Formula: C41H68O14 Molecular Weight: 784.97 CAS No.:84687-43-4 Assay Test method: HPLC-ELSD