Constituents of the roots, the stem bark, and the leaves of Clausena excavata BURM. f. (Rutaceae) grown in a greenhouse at Okitsu Branch, Fruit Tree Research Station, Shizuoka, were studied. New carbazole alkaloids named clauszoline-H (1), -I (2), and -J (4) from the roots, clauszoline-K (6) and -L (7) from the stem bark, and clauszoline-M (8) from the leaves were isolated, together with known carbazoles and coumarins, and their structures were elucidated by spectroscopic methods.
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Ito et al. (1997) studied this question.