p-Toluenesulfonic acid monohydrate → 3-Ethoxy-4-[(6-methyl-5-oxo-2-propan-2-yl-2,6,9,11-tetrazabicyclo[5.4.0]undeca-7,9,11-trien-10-yl)amino]benzoic acid

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10-Chloro-6-methyl-2-propan-2-yl-2,6,9,11-tetrazabicyclo[5.4.0]undeca-7,9,11-trien-5-one (Intermediate 10; 625 mg, 2.45 mmol), 4-amino-3-ethoxybenzoic acid (Intermediate 164; 509 mg, 2.82 mmol) and 4-toluenesulphonic acid mono hydrate (1.17 g, 6.13 mmol) were heated at 140° C. in 4-methyl-2-pentanol (15 mL) for 1.5 hours. The mixture was cooled and filtered to yield the title compound as a white solid (135 mg, 14%). The filtrate was absorbed on to an SCX column, washed with methanol and eluted with ammonia in methanol. Product containing fractions were concentrated and purified by column chromatography (1%-3% MeOH/DCM) to yield the title compound as a white solid (115 mg, 12%)

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