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Compound 73 was prepared in a similar fashion to the synthesis of compound 70 starting from compound 72 (1.67 g, 4.5 mmol). Amine 73 (1.06 g, 99%) was isolated as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 1.32 (m, 2H), 1.54 (m, 2H) 2.55 (m, 2H), 3.45 (m, 2H), 3.75 (m, 3H), 3.94 (m, 2H), 6.83 (d, 2H), 7.08 (d, 2H).