Provided is a process for preparing a choline salt of [4,6-bis(dimethylamino)-2-(4-{[4-(trifluoromethyl)benzoyl]amino}benzyl)pyrimidin-5-yl] acetic acid. The process of the invention is useful for preparing the salt in purer forms of the salt. Also disclosed is a more pure form of the of choline salt of [4,6-bis(dimethylamino)-2-(4-{[4-(trifluoromethyl)benzoyl]amino}benzyl)pyrimidin-5-yl] acetic acid.本發明提供一種用於製備[4,6-雙(二甲基胺基)-2-(4-{[4-(三氟甲基)-苯甲醯基]胺基}苄基)嘧啶-5-基]乙酸之膽鹼鹽的方法。本發明方法適用於製備呈較純凈鹽形式的鹽。本發明亦揭示一種[4,6-雙(二甲基胺基)-2-(4-{[4-(三氟甲基)-苯甲醯基]胺基}苄基)嘧啶-5-基]乙酸之更純淨形式的膽鹼鹽。