Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → N-(5-chloro-3-methoxypyrazin-2-yl)-4'-hydroxy-N-(isobutoxycarbonyl)-2-biphenylsulphonamide

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N-(5-Chloro-3-methoxypyrazin-2-yl)- N-(isobutoxycarbonyl)-4'-[2-(2 H)-tetrahydropyranyloxy]-2-biphenylsulphonamide (1.15 g) and pyridinium-p-toluenesulphonate (50 mg) in ethanol (50 ml) was heated at 60° C. for 3 hours. Volatile material was removed by evaporation and the residue was triturated with etherexane (1:1 v/v) to give N-(5-chloro-3-methoxypyrazin-2-yl)-4'-hydroxy- N-(isobutoxycarbonyl)-2-biphenylsulphonamide (0.96 g), m.p. 175°-177° C.; microanalysis found: C, 53.9; H, 4.8; N, 8.2%; C21H22C1N3O6 requires: C, 53.7; H, 4.5; N, 8.5%.

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