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The title compound 2-[(4-methoxy-6-methylthio-2-pyrimidinyl)aminocarbonyl-aminosulfonyl]benzoic acid methyl ester (C15H16N4O6S2,Mr = 412.44) was obtained by the reaction of (4-methoxy-6-methylthio-2-pyrimidinyl)amine with 2-methoxylcarbonylbenzene-sulfony