, 2–5% methanol/chloroform) to afford 21 mg (9%) of the title compound as a pale tan solid. 1H NMR (400 MHz, DMSO-d6) δ 11.58 (s, 1H), 8.42 (d, J = 6.8 Hz, 1H), 7.62 (s, 1H), 7.32 (s, 1H), 7.08 (t, J = 7.7 Hz, 1H), 7.00 (d, J = 7.8 Hz, 1H), 6.49 (d, J = 7.3 Hz, 1H), 4.49–4.55 (m, 1H), 4.32–4.41 (m, 1H), 4.21–4.30 (m, 1H), 4.12 (t, J = 16.9 Hz, 1H), 3.87 (