Ethanesulfonic acid → n-{2-Tert-butyl-1-[(4,4-difluorocyclohexyl)methyl]-1h-benzimidazol-5-yl}ethanesulfonamide esylate

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N-{2-tert-butyl-1-[(4,4-difluorocyclohexyl)methyl]-1H-benzimidazol-5-yl}ethanesulfonamide (111 mg) was slurried in methyl tert-butyl ether (2.1 ml) at 48° C. and ethane sulphonic acid (23 μl, 95%) was added. Shortly after the slurry became thinner and then recrystallised into a thicker slurry which was left over night at room temperature. The resulting crystals were filtered off, washed with methyl tert-butyl ether (2×400 μl) and dried at 40° C. under vacuum. A total of 105 mg (yield 75%) crystalline N-{2-tert-butyl-1-[(4,4-difluorocyclohexyl)methyl]-1H-benzimidazol-5-yl}ethanesulfonamide esylate was obtained.

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