Cis-shegansu B (5) is a cis isomer of shegansu B. (+)-bisisorhapontigenin A (6) is isolated as a natural product for the first time.

• cis-shegansu B(5)为二聚体射干素B的顺式异构体； (+)-Bisisorhapontigenin A(6)为首次以天然产物形式得到的异丹叶大黄素二聚体；