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Yellow solid (yield: 54%); 1H NMR (500 MHz, DMSO-d6) δ 10.70 (s, 1H), 8.59 (s, 1H), 8.49 (s, 1H), 8.13 (d, J = 12 Hz, 1H), 7.77 (s, 1H), 7.31 (d, J = 12 Hz, 1H), 6.53 (s, 2H), 4.84 (s, 2H), 3.63 (s, 1H); 13C NMR (125 MHz, DMSO-d6) δ166.1, 160.6, 147.4, 146.1, 143.1, 133.2, 131.5, 127.9, 122.0, 121.8, 119.5, 117.9, 117.1, 112.6, 111.6, 103.6, 78.8, 78.3, 53.2; HRMS m/z: [M-H]- Calcd for C19H10NO7, 364.0463, Found 364.0450.
