。1H NMR (400 MHz, CDCl3) δ 7.37 (dd, J = 14.3, 7.0 Hz, 8H), 7.32 - 7.27 (m, 2H), 6.08 (s, 1H), 5.31 (s, 1H), 4.06 (dd, J = 11.3, 4.5 Hz, 1H), 3.58 (dd, J = 11.3, 5.7 Hz, 1H), 2.94 (m, 1H), 1.03 (d, J = 7.0 Hz, 3H). 13C NMR (100 MHz, CDCl3) δ 141.68, 141.18, 139.98, 128.41, 128.39, 127.84, 127.73, 127.25, 126.15, 125.40, 76.07, 68.54, 30.65, 16.65. HRMS (ESI): calcd for C18H18NaO+: 273.1250, found: 273.1249