Two canthin-6-one alkaloids, luotonins C and D, and two phenylpropanoids. d
ihydrosinapyl ferulate and dihydroconiferyl ferulate, were isolated from th
e aerial parts of Peganum nigellastrum along with four known alkaloids, har
mine, 3-phenylquinoline, 3-(4-hydroxyphenyl)quinoline and 3-(1H-indol-3-yl)
quinoline. Their structures were elucidated by spectroscopic techniques. Th
e structures of luotonins C and D were also confirmed by chemical synthesis
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