1H NMR (400 MHz, CDCl3) δ 7.41 (d, J = 7.3 Hz, 2H), 7.33 (d, J = 6.8 Hz, 4H), 7.28 - 7.24 (m, 1H), 7.20 (d, J = 7.4 Hz, 2H), 6.21 (s, 1H), 4.64 (d, J = 9.7 Hz, 1H), 4.60 - 4.48 (m, 2H), 2.76 - 2.62 (m, 2H), 2.36 (s, 3H). 13C NMR (100 MHz, CDCl3) δ 140.1, 139.4, 137.4, 134.5, 129.2, 128.5, 127.4, 126.0, 124.8, 122.3, 75.9, 66.9, 34.9, 21.2. HRMS (ESI): calcd for C18H18NaO+: 273.1250, found: 273.1254.