The coumarin imperatorin and the quinoline alkaloids kokusagine, japonin, and O-methylbalfourodinium salt were isolated from the leaves and from the stems of Orixa japonica Thunb. A new ketonic quinoline alkaloid, orixinone [2,4-dimethoxy-7,8-methylenedioxy-3-(3-methyl-2-oxobutyl)quinoline], was identified.
W. J. Donnelly and M. F. Grundon, J. Chem. Soc., Perkin Trans. 1, 1972, 2116 DOI: 10.1039/P19720002116
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