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Compound I-24 was prepared by the method which was identical with that for preparing compound 13a, wherein compound 18 (70 mg, 0.184 mmol) was used as the starting material. White solid (100%). m.p. 163-165° C. 1H NMR (300 MHz, DMSO-d6): δ 8.20 (s, 1H), 8.11 (dt, J=2.4, 6.0 Hz, 1H), 7.99 (d, J=1.3 Hz, 1H), 7.45-7.41 (m, 2H), 7.15 (d, J=1.3 Hz, 1H), 5.27 (t, J=5.8 Hz, 1H), 4.57 (d, J=5.8 Hz, 2H), 4.07 (t, J=4.6 Hz, 4H), 3.95 (s, 2H), 3.80 (t, J=4.6 Hz, 4H), 2.44 (s, 6H). MS (EI) m/e (%): 367 (M+, 16).

1. customCompound I-24 was prepared by the method which