Two new iridoids, called viteoids I and II, were isolated from Viticis trifoliae Fructus (fruit of Vitex rotundifolia L. fil.) along with six known iridoids, eucommiol, iridolactone, pedicularis-lactone, agnuside, VR-I and 1-oxo-eucommiol. The chemical structures of viteoids I and II were determined on the bases of spectroscopic data.
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Ono et al. (1997) studied this question.