1H NMR (400 MHz, CDCl3) δ 7.41 (d, J = 7.4 Hz, 2H), 7.32 (d, J = 7.4 Hz, 2H), 7.23 (dd, J = 16.5, 9.4 Hz, 1H), 6.85 (s, 2H), 6.26 (s, 1H), 5.01 (d, J = 10.9 Hz, 1H), 4.49 (q, J = 17.1 Hz, 2H), 2.98 - 2.86 (m, 1H), 2.46 (s, 1H), 2.41 (s, 6H), 2.25 (s, 3H). 13C NMR (100 MHz, CDCl3) δ 139.9, 136.9, 136.2, 134.8, 134.3, 130.1, 128.5, 127.4, 124.7, 122.6, 73.9, 66.8, 31.3, 20.9, 20.8. HRMS (EI): calcd for C20H22O: 278.1671, found: 278.1673.