摘要: Reinvestigation of the flowers Alstonia scholaris Pakistan origin have resulted in isolation three new triterpenoids, two ursane type, 3β -acetate-24-nor-urs-4,12-diene ester triterpene (1) and -hydroxy-24-nor-urs-4,12,28-triene (2), one oleanane 3,28-β - diacetoxy-5-olea-triterpene (3), together with known triterpenes,α-amyrin acetate (4) ursolic acid (5). This is first report 4 5 from flower part this species. The structures 1 were elucidated aid extensive NMR-spectroscopic studies.
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