Glucoside of coumaric acid (so-called bound coumarin). Melilotoside occurs as a precursor of coumarin e.g. in Galium odoratum or in Melilotus officinalis, the true me lilot. When the plants wither, an enzymatic splitting of the molecule occurs. Under the influence of UV light, the genuinely present trans-cumaric acid isomerizes into cis-cumaric acid (= coumarin acid), which is then converted into cyclic coumarin.
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Melilotoside
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- Khodakov GV et al.(1996)Triterpenes and steroid saponins isolated from two Melilotus species. Adv Exp Med Biol 405:211-222.