3-{[3-Chloro-2-(2-trifluoromethyl-biphenyl-4-yl)-benzo[b]thiophen-5-ylmethyl]-amino}-propionic acid tert-butyl ester → 3-{[3-Chloro-2-(2-trifluoromethyl-biphenyl-4-yl)-benzo[b]thiophen-5-ylmethyl]-amino}-propionic acid

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3-{[3-Chloro-2-(2-trifluoromethyl-biphenyl-4-yl)-benzo[b]thiophen-5-ylmethyl]-amino}-propionic acid tert-butyl ester (43 mg, 0.079 mmol) is dissolved in TFA/CH2Cl2 (1/1) (1 mL). The solution is stirred at room temperature for an hour. The mixture is concentrated and purified by reversed phase preparative LC/MS to give 23 mg of 3-{[3-chloro-2-(2-trifluoromethyl-biphenyl-4-yl)-benzo[b]thiophen-5-ylmethyl]-amino}-propionic acid: 1H NMR (CD3OD, 400 MHz) δ 8.10 (s, 1H), 7.96-8.02 (m, 3H), 7.54 (d, 1H), 7.46 (d, 1H), 7.35-7.37 (m, 3H), 7.28-7.29 (m, 2H), 4.37 (s, 2H), 3.26 (m, 2H), 2.71 (m, 2H), MS (ES+) 490.3 (M+H+).

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