The following was added sequentially to DCM (6 mL): 1-(1-(4-chlorobenzyl)-1H-indole-2-carbonyl)piperidine-4-carboxylic acid (134 mg, 0.340 mmol), DIPEA (0.178 mL, 1.019 mmol), EDC (78 mg, 0.408 mmol), HOBT (62.4 mg, 0.408 mmol), and 2-indanmethanamine hydrochloride (62 mg, 0.340 mmol). The mixture was stirred for 18 h at rt, at which time the solution diluted with a 1:1 solution of ethyl acetate:diethyl ether and washed with 1M HCl (1×), 10% aq. sodium carbonate (1×) and brine (1×). The organic phase was dried with magnesium sulfate and concentrated in vacuo. The resulting residue was dissolved in EtOAc and precipitated out hexanes, and then collected over a filter and washed with diethyl ether to give the title compound as a white solid. (Yield: 72 mg, 0.137 mmol, 41%) 1H NMR (400 MHz, CDCl3) 7.63, 7.32, 7.28-7.11, 7.01, 6.62, 5.45, 5.38, 4.36, 3.70-3.52, 3.51-3.07, 3.06-2.76, 2.30-2.19, 1.86-1.61, 1.49
