Strychnos camptoneura

Antirhine methobromide (12) has been isolated from Strychnos camptoneura Gilg and Busse (20) however, it is not certain that this is the naturally occurring form of the alkaloid. In view of H-NMR evidence, a orientation was suggested for the Ab-methyl group of 12. 

Monoterpenoid Alkaloids.—Corynantheine-Heteroyohimbine-Yohimbine Group, and Related Oxindoles. The first recorded extraction of the leaves and twigs of Peschiera laeta Mart, has yielded geissoschizol, a base not previously found in the Peschiera genus. Antirhine and, to a lesser extent, its quaternary Nb-metho-derivative, occur in the bark of Strychnos camptoneura Gilg. et Busse and in Amsonia elliptica, which also contains tetrahydrosecamine, pleiocarpamine,... 

F.V.M., from the leaves, stems, and flowers of U. guaianensis (Aubl.) Gmel., from Strychnos camptoneura, and from the root bark of Nauclea latifolia Sm. Angustoline, and very probably (t.l.c. evidence) angustidine also, occur in U. rhynchophylla and U. homomallaand angustoline occurs in N. latifolia. Preliminary t.l.c. evidence was also obtained for the presence of angustine-type alkaloids in a number of other African and Asian Strychnos species. "... 

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