1H NMR (400 MHz, CDCl3) δ 8.28 (s, 1H), 7.98–7.83 (m, 4H), 7.62–7.51 (m, 2H), 5.96 (s, 1H), 5.74 (s, 1H), 3.60 (s, 2H), 2.17 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 196.9, 144.0, 135.3, 134.7, 132.2, 131.2, 129.4, 128.3, 128.3, 127.8, 126.8, 125.7, 125.3, 35.5, 15.6. HRMS (EI): calcd for C15H14O: 242.0765; found: 242.0761.