A new acridone alkaloid, 1, 3, 5-trihydroxy-10-methylacridone (8), and two new coumarins, trans-clausarinol (9) and khelmarin-D (11), were isolated from the root of Yalaha [several hybrid seedlings resulting from a cross of Duncan grapefruit (Citrus paradisi MACF.)×Dancy tangerine (C. tangerina HORT. ex TANAKA)], and structures were determined on the basis of spectroscopic evidence. Seventy known coumarins, acridone alkaloids and miscellaneous compounds were also characterized.
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Takemura et al. (1996) studied this question.