The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 20272081).
Six indole alkaloids were isolated from the stems of Ervatamia yunnanensis. Among them, 10-hydroxy-19, 20-dihydroisositsirikine (I) is new. The other five are known alkaloids, namely: matrine (Ⅱ), 19, 20-dihydro...