Two New Diterpenoid Lactams from Spiraea japonica var. ovalifolia

Two New Diterpenoid Lactams from Spiraea japonica var. ovalifolia Two New Diterpenoid Lactams from <i>Spiraea japonica</i> var. <i>ovalifolia</i> New Diterpene Alkaloids from the Roots of <i>Spiraea </i><i>japonica</i> New Diterpene Alkaloids from the Roots of Spiraea japonica Diterpene alkaloids from roots of Spiraea japonica Three New Diterpene Alkaloids from Spiraea japonica Three New Diterpene Alkaloids from Spiraea japonica Four New C20-Diterpene Alkaloids, Spirasine I, Spirasine II, Spirasine VII and Spirasine VIII from Spiraea japonica New Spiramines from Spiraea japonica var. ovalifolia Two New Diterpenoid Alkaloids from Spiraea japonica L. f. var. fortunei(Planchon) Rehd.