1H NMR (400 MHz, CDCl3) δ 7.29 (dd, J = 16.4, 9.2 Hz, 1H), 7.14 (d, J = 7.7 Hz, 1H), 7.09 (d, J = 10.0 Hz, 1H), 6.97 (t, J = 8.1 Hz, 1H), 6.73 (d, J = 15.9 Hz, 1H), 6.04 (d, J = 15.9 Hz, 1H), 1.55 (s, 1H). 13C{1H} NMR (101 MHz, CDCl3) δ 163.06 (d, J = 245.9 Hz), 138.05, 131.78, 130.17 (d, J = 8.4 Hz), 128.90 (d, J = 2.5 Hz), 123.15, 122.57 (d, J = 2.7 Hz), 114.98 (d, J = 21.4 Hz), 112.99 (d, J = 22.0 Hz), 34.94, 27.60. m/z = 189. HRMS (ESI) m/z calcd for C12H12FNNa+ [M + Na]+:212.0846, found 212.0849.