To 3-amino-5-trifluoromethylhippuric acid hydrochloride [prepared according to Example M, Steps A and B substituting 3-nitro-5-trifluoromethylbenzoyl chloride (prepared from 3-nitro-5-trifluoromethylbenzoic acid (Lancaster) and thionyl chloride for M-nitrobenzoyl chloride in Example M, Step A] (3 g, 0.01 mole) in CH3CN (5 mL) was added the product from Example 472, Step A (2.2 g, 0.01 mole). The reaction was stirred at 35° C. for 3 days then at reflux for 4 hours. After cooling, the CH3CN was decanted off, the residue slurried several times in ether (ether decanted off) and then dried to yield 3-(4,5-dihydro-1H-imidazol-2-yl)amino-5-trifluoromethylhippuric acid.HCl (2.5 g) as a white solid.
