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The title compound (70 mg, 32%) as a yellow powder was prepared from 3-chloro-6-(2-chlorophenyl)-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazine (168 mg, 0.45 mmol) and 3-(ethylamino)azetidine-3-carboxamide (291 mg, 1.35 mmol) in a manner analogous to that in which 1-(6-(2-chlorophenyl)-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)-3-(ethylamino)pyrrolidine-3-carboxamide was prepared. HPLC/MS (method A): retention time=2.76 min, (M+H)+=482.2. 1H NMR (DMSO-d6, 400 MHz): δ 8.19 (s, 1H), 7.59-7.64 (m, 1H), 7.39-7.48 (m, 3H), 7.28-7.37 (m, 3H), 7.17-7.25 (m, 3H), 4.44 (d, J=8.07 Hz, 2H), 4.08 (d, J=8.07 Hz, 2H), 2.84 (bs, 1H), 2.41 (m, 2H), 1.02 (t, J=7.09 Hz, 3H).

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