1. Antibiotics Research and Re-evaluation Key Laboratory of Sichuan ProvinceSichuan Industrial Institute of AntibioticsChengdu University Chengdu 610052 China
2. Chengdu Institute of Organic ChemistryChinese Academy of Sciences Chengdu 610041 China
3. State Key Laboratory of Southwestern Chinese Medicine ResourcesSchool of PharmacyChengdu University of Traditional Chinese Medicine Chengdu 611137 China