A method for producing MMA-d.sub.8 which includes a step of exchanging D in hydroxyl group of methanol-d.sub.4 represented by the formula: CD.sub.3OD with H to prepare the methanol-d.sub.3 represented by the formula CD.sub.3OH and simultaneously recovering a deuterium-containing compound, and a step of reacting methanol-d.sub.3 with sulfuric acid salt of methacrylic acid amide represented by the formula CD.sub.2=(CD.sub.3)CO(NH.sub.2.H.sub.2SO.sub.4) to prepare MMA-d.sub.8 represented by the formula: CD.sub.2=(CD.sub.3)COOCD.sub.3.

 
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< Compound having phosphorylcholine group, polymer thereof and process for producing the same

> Composition comprising at least one substituted 2-[2-(4-amino phenyl)ethenyl]-1-pyridinium derivative, process for treating keratin fibres using it, device and use thereof
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