Two new alkaloids, luotonins A and B, were isolated from the aerial parts of Peganwn nigellasmun along with four known quinazoline type alkaloids.The structures of l u o t o ~n s A and B were determined to be 1 and 2, respectively, by NMR spectroscopic evidence.Both new alkaloids have a unique structure comprising a quinoline and a quinazoline skeletons.
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Nomura et al. (1997) studied this question.