Fengjie Yao, Yufei Wu, Yidian Sheng, Kuan Yu, Peirong Rao, Jun Xuan, Hanfeng Ding. "Asymmetric Total Syntheses of Hetidine-Type C
                    <sub>20</sub>
                    -Diterpenoid Alkaloids: Spirasines V and VI, Spiradine D, and the Proposed Structures of Spirafines II and III." Journal of the American Chemical Society (2025). https://doi.org/10.1021/jacs.5c13564