Oxindole alkaloids from Alstonia macrophylla
1996
Wong, W.H. | Lim, P.B. | Chuah, C.H.
Two new oxindole alkaloids, Nb-demethylalstophyllal oxindole and alstonal, together with three known alkaloids, Nb-demethylalstophylline oxindole, alstonisine and talcarpine, have been isolated from the bark of Alstonia macrophylla. Structures of the alkaloids were assigned by spectral methods.
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