7Chan W R,Taylor D R,Willis C R.The structure of neoandrographolide-a diterpene glucoside from Andrographis paniculam nees[J].Tetrahedron Lett,1968,46:4803-4806.
8Waridel P,Wolfender J L,Lachavanne J B,et al.ent-Labdane direrpenes from the aquatic plant Potamogeton pectinatus[J].Phytochemistry,2003,64(8):1309-1317.