The absolute structure of tanabalin (= 12S-acetoxyhautriwaic acid), an insect antifeedant isolated from Tanacetum balsamita, was determined by X-ray crystallography together with modified Mosher’s method, in which an anomalous Δδ value of a proton was verified with an l-adrenaline derivative as a model compound.
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Kubo et al. (1996) studied this question.
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