Abstract
Four indole alkaloids have been isolated and characterized from the tree bark of Alstonia muelleriana Domin. One of these is the previously known dimeric indole alkaloid, villalstonine (I). A second probably dimeric indole alkaloid, alstonisidine (II), and two monomeric indole alkaloids, alstonisine (III) and alstonerine (IV) are also described.
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