Five sinapic acid esters were isolated from cotyledons of Raphanus sativus and have been identified with the aid of electron impact (El)-, field desorption (FD)-mass spectrometry and NMR spectroscopy: 6,3′-disinapoylsucrose, sinapoylcholine (sinapine), 6-sinapoylglucoraphenine, 1-si- napoylglucose, and sinapoylmalate. Three of these derivatives are metabolically related in the sequence sinapoylcholine →1 -sinapoylglucose →sinapoylmalate.
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Linscheid et al. (1980) studied this question.
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