White crystals. Mp = 119–120 °C. 1H NMR (400 MHz, DMSO-d6): δH 6.30 (s, 1H, H-5), 6.19 (d, J = 8.0 Hz, 1H, OH), 6.13 (s, 1H, OH), 3.92 (d, J = 8.0 Hz, 1H, H-1), 3.62 (s, 3H, H3-9), 2.77 (s, 2H, H2-7); 13C NMR (125 MHz, DMSO-d6): δC 147.1 (qC, C-3), 133.7 (CH, C-5), 119.4 (qC, C-2), 118.6 (qC, C-8), 113.7 (qC, C-4), 77.5 (CH, C-1), 73.6 (qC, C-6), 59.8 (CH3, C-9), 26.4 (CH2, C-7); MS (CI): m/z = 339.8 [M + H]+.

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