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Sinapine, the alkaloid which exists as sulphocyanate in white mustard seed, yields, under the same reaction as that applied to atropine and piperine, quite different results.

When boiled with baryta water, sinapine decomposes into sinapic acid, C11H12O5, and choline, C5H15NO2, the latter a well-known constituent of the bile, and produced also in the decomposition of the lecithin of the brain and yolk of egg.