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To a cold (0° C.) solution of tert-butyl 4-({{4-[(dodecylamino)carbonyl]benzyl}[ethoxy(oxo)acetyl]amino}methyl)piperidine-1-carboxylate (3.84 g, 6.24 mmol) in DCM (25 mL) was added a 4 N solution of HCl in dioxane (31.1 mL) and the resulting reaction mixture was stirred 4 h at 0° C. Evaporation of the solvents gave a white amorphous solid (73%). 1H NMR (DMDO-d6, 300 MHz) δ 9.03 (m, 0.5H), 8.70 (m, 0.5H), 8.50 (m, 1H), 7.85 (m, 2H), 7.33 (m, 2H), 4.56 (d, 2H, J=8.9 Hz), 4.40-4.20 (m, 2H), 3.35-3.10 (m, 7H), 2.80 (m, 2H), 1.70 (m, 2H), 1.52 (m, 2H), 1.43-1.15 (m, 21H), 0.86 (m, 3H). M−(LC/MS(ESI)): 514.4; M+(LC/MS(ESI)): 516.4. HPLC (Condition A), Rt: 4.68 min (HPLC purity: 99.4%).

1. customthe resulting reaction mixture
2. customEvaporation of the solvents