Isoetin-4'-O-beta-glucuronide, a new derivative of the rare 2',4', 5'-trihydroxyflavone isoetin, has been isolated from Adonis aleppica, along with the known vitexin-2"-O-4-rhamnoside. These structures were established by means of DCI-NH3-mass spectral and NMR methods including full establishment of the CH-spin systems for both compounds. Furthermore, structural evidence is given for the presence of sinapoylglucose representing the first phenylpropanoid glycoside isolated from a member of the genus Adonis.
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