Callus tissue from the stems of Phellodendron amurense (Rutaceae) produced a new indolopyridoquinazoline-type alkaloid, 7, 8-dihydroxyrutaecarpine (2), together with known 7-hydroxyrutaecarpine (1). Their structures were established using spectroscopic methods.
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Ikuta et al. (1998) studied this question.
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