Diterpene alkaloids from roots of Spiraea japonica

Diterpene alkaloids from roots of Spiraea japonica New Diterpene Alkaloids from the Roots of <i>Spiraea </i><i>japonica</i> New Diterpene Alkaloids from the Roots of Spiraea japonica Three New Diterpene Alkaloids from Spiraea japonica Three New Diterpene Alkaloids from Spiraea japonica The structures of four new diterpene alkaloids, spiramines A, B, C, and D. Spiromines A, B, C, and D New Diterpene Alkaloids from Spiraea japonica var. acuminata Franch Spiromines A, B, C, and D New Diterpene Alkaloids from Spiraea japonica var. acuminata Franch Four New C20-Diterpene Alkaloids, Spirasine I, Spirasine II, Spirasine VII and Spirasine VIII from Spiraea japonica Two New Diterpenoid Alkaloids from Spiraea japonica L. f. var. fortunei(Planchon) Rehd.