1H NMR (400 MHz, CDCl3) δ 7.42 (d, J = 7.2 Hz, 2H), 7.34 (m, 3H), 7.28 (s, 2H), 7.23 (d, J = 7.6 Hz, 1H), 7.13 (d, J = 7.3 Hz, 1H), 6.21 (s, 1H), 4.64 (d, J = 9.9 Hz, 1H), 4.53 (d, J = 21.7 Hz, 2H), 2.68 (dd, J = 23.0, 12.9 Hz, 2H), 2.38 (s, 3H). 13C NMR (100 MHz, CDCl3) δ 142.3, 140.1, 138.2, 134.5, 128.5, 128.5, 128.4, 127.4, 126.7, 124.8, 123.1, 122.2, 76.1, 66.9, 35.0, 21.5. HRMS (ESI): calcd for C18H19O+: 251.1430, found: 251.1433.