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| - An N-substituted benzenesulphonamide compound wherein the benzene ring is substituted in the 2-position by a methoxy group, which compound has the general formula ##STR81## in which n is 2 or 3,R1 and R2 are a hydrogen atom, methyl or ethyl, R3 is a hydrogen atom, an NO2 group, an NH2 group, or a halogen, R4 is a hydrogen atom, -NH2, a halogen or a sulphonamide group, or the addition salts with a
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