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Oridonin, a new diterpenoid from Isodon japonicus and Isodon trichocarpus, has been shown to be ent-7β,20-epoxy-1β,6α,7α,l4α-tetrahydroxy-l6-kauren-15-one (I) on the basis of chemical and spectroscopic evidence.
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Fujita et al. (1970) studied this question.
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