2-(Bis(2-hydroxyethyl)amino)ethanesulphonic acid → N,N-di-[2-(3,4,5-trimethoxybenzoyloxy)ethyl]taurine

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8.5 G of the product obtained in Example 2 (a) was suspended in 25 ml of anhydrous pyridine, and 18.4 g of 3,4,5-trimethoxybenzoyl chloride added slowly under agitation. After being left for one hour at ambient temperature the mixture was heated to 80° C. for a further hour. It was then cooled to ambient temperature, diluted with 50 ml of ethanol and left to stand in a refrigerator. A colourless crystalline compound precipitated which milted at 174°-178° C. After recrystallisation from methanol, the melting point was 180°-183° C. The yield was 11.5 g of pure product.

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