Combine 1-(3,4,5-trimethoxybenzoyl)-3-(2-(4-(1-(2-methoxycarbonylbenzyl)-1H-benzimidazol-2-yl-amino)piperidin-1-yl)ethyl)-3-phenylpyrrolidine (0.6 g, 0.8 mmol) and lithium hydroxide hydrate (0.11 g, 2.4 mmol) in tetrahydrofuran (24 mL) and water (8 mL). After 18 hours, evaporate the reaction mixture in vacuo to remove the tetrahydrofuran to obtain a solid. Collect the solid and add tetrahydrofuran (40 mL). Add a solution of methanesulfonic acid (0.24 g, 2.6 mmol) in tetrahydrofuran (3 mL). Add diethyl ether (200 mL) to give a residue. Decant the supernatant, add diethyl ether, and stir to give a solid. Collect the solid and dry in vacuo to give the title compound: mp; 161-175° C.
