“…Purification by flash chromatography (PE/EA = 3:1 as an eluent, R f = 0.32) gave a yellow solid (32.1 mg, 86% yield), mp 117-118 • C,1 H NMR (400 MHz, CDCl 3 ) δ 8.10 (d, J = 7.6 Hz, 1H), 7.82 (t, J = 7.2 Hz, 1H), 7.72 (t, J = 7.6 Hz, 1H), 7.57 (d, J = 7.6 Hz, 1H), 7.46 (s, 1H), 7.09 (d, J = 7.6 Hz, 1H), 7.03 (t, J = 7.6 Hz, 1H), 6.71 (t, J = 7.6 Hz, 1H), 6.20 (d, J = 8.0 Hz, 1H), 3.70 (dd, J = 13.2, 5.2 Hz, 1H), 3.46-3.39 (m, 4H), 3.23-3.14 (m, 1H), 2.74 (d, J = 15.2 Hz, 1H), 1.74 (s, 3H) ppm 13. C NMR (100 MHz, CDCl 3 ) δ 199.6, 199.5, 164.9, 150 5,. 143.1, 142.2, 136.8, 135.5, 135.3, 134.5, 129.6, 127.2, 126.0, 125.7, 123.1, 123.0, 100.5, 72.0, 69.1, 50.6, 42.5, 30.7, 25.4 ppm.…”