Coumarin and herniarin are formed in lavender from labeled o- and p-coumaric acids, respectively. At least part of the herniarin exists in lavender as a glycoside, presumably a 4-methoxycoumarinic acid glycoside, which yields free herniarin on hydrolysis. Biosynthesis of herniarin by successive para- and ortho- hydroxylation of cinnamic acid is indicated.
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Stewart A. Brown (1962) studied this question.
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