The dimeric indole alkaloid callichiline (2), C42H48O5N4, has been isolated from Callichilia (Hedranthera) barteri (HOOK. f.) PICHON along with vobtusine (1) and beninine (3). Its chemical reactions and spectral properties have shown that callichiline is made up of the same two monomeric ‘halves’ as vobtusine, that is beninine (3) and the vincadifformine analogue of beninine.
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Agwada et al. (1967) studied this question.
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