Cynanester A comes from crom Cynanchum chinense R. Br. References: Wu YD, Zhang FQ, Zhang M, Yan QS, Huang BS, Chen ZL. [Isolation and identification of cynanester A from Cynanchum chinense R. Br]. Yao Xue Xue Bao. 1991;26(12):918-22. Chinese. PubMed PMID: 1823991.

纯度：≥98%

CAS：143502-52-7