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Dry herb of Cynanchum paniculatum and chemical composition of its major constituent: (a) dry herb of XCQ; (b) paeonol (C99H10O3, CAS number 552-41-0); (c) antofine (C23H25NO3, CAS number 32671-82-2); (d) cynanversicoside A (C42H64O15, CAS number 138875-31-7); (e) cynanversicoside C (C28H40O10, CAS number 934701-03-8); (f) 3-hydroxy-4-methoxy-acetophenone (C9H10O3, CAS number 6100-74-9).
