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Following the procedure for 477, compound 330 and iodomethane were reacted to give 502 (0.039 g, 20%). 1H NMR (500 MHz, DMSO) δ 9.05 (d, J=2.3, 1H), 8.09 (s, 1H), 7.73 (dd, J=6.7, 1.9, 1H), 7.66 (ddd, J=10.7, 7.7, 2.1, 2H), 7.07 (d, J=8.4, 1H), 6.34 (t, J=6.8, 1H), 5.94 (dt, J=13.2, 6.6, 1H), 4.40 (t, J=4.9, 2H), 3.53 (s, 3H), 3.46 (t, J=5.0, 2H), 1.55 (d, J=6.6, 6H). MS (ESI(+)): m/z 420.2 (M+H).

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