State Key Laboratory of Phytochemistry and Plant Resources in West China;
Kunming Institute of Botany;
Chinese Academy of Sciences;
No.132 Lanhei Road;
Kunming 650201;
China;
Yunnan Key Laboratory of Natural Medicinal Chemistry;
Kunming 650201;
China;
ESI-IT-TOF-MSn; Fragmentation rules; Secoiridoid trimers; Swerilactones H-K; Retro-Diels-Alder(RDA)cleavage;