1H NMR (400 MHz, CDCl3) δ 7.54 (d, J = 7.4 Hz, 1H), 7.42 (d, J = 7.2 Hz, 2H), 7.34 (m, 2H), 7.30 - 7.24 (m, 2H), 7.19 (d, J = 9.3 Hz, 2H), 6.23 (s, 1H), 4.85 (d, J = 9.9 Hz, 1H), 4.63 - 4.48 (m, 2H), 2.75 - 2.60 (m, 2H), 2.38 (s, 3H). 13C NMR (100 MHz, CDCl3) δ 140.4, 140.1, 134.7, 134.6, 130.4, 128.5, 127.5, 127.4, 126.4, 125.6, 124.8, 122.3, 73.0, 66.9, 33.6, 19.3. HRMS (ESI): calcd for C18H18NaO+: 273.1250, found: 273.1256.