Robuta

https://www.semanticscholar.org/topic/Stemona-japonica/2231339 Stemona japonica | Semantic Scholar japonicasemanticscholar https://pubs.rsc.org/en/Content/ArticleLanding/1973/C3/C39730000125 X-Ray crystallographic determination of the structure of stemonamine, a new alkaloid from Stemona... The structure of stemonamine (I) isolated from Miq. has been determined by -ray crystal-structure analysis of its hydrochloride and the structure (II) is...