| 摘要 |
The cpds. of formula (I), in which R1 to R4 can be various radicals and their salts, for use as anti-ulcer agents, are made by reaction of a cpd. of formula (II) or its salt with a carboxylic acid of formula R8COOH, in which R8 can be various radicals, or one of its reactive derivs., in an inert solvent at 0-180 deg.C..
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