https://knova.um.edu.my/research_publications_2021_2025/2282/
"Morphinan alkaloids from the leaves of Alphonsea cylindrica and their " by Kin-Hau Cho, Siow-Ping...
A phytochemical study has been carried out on CH (2) Cl (2) extract of Alphonsea cylindrica leaves, resulting in the isolation of three new morphinan...