Three new monomeric carbazole alkaloids, 3-formylcarbazole (1), N-methoxy-3-formyl-carbazole (2), and pyrayaquinone-C (3), and two new binary carbazoles, murrafoline-E (4) and murrafoline-F (5), were isolated from root bark of Murraya euchrestifolia HAYATA (Rutaceae) collected in Taiwan, and their structures were elucidated.
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Ito et al. (1988) studied this question.