1H NMR (400 MHz, CDCl3) δ 7.65 (s, 1H), 7.45 (s, 3H), 7.11 (d, J = 7.7 Hz, 4H), 6.90 (d, J = 7.9 Hz, 2H), 6.01 (s, 4H). 13C{H} NMR (101 MHz, CDCl3) δ 148.12, 147.16, 141.43, 135.50, 129.11, 125.58, 125.51, 120.71, 108.58, 107.73, 101.16. m/z (GC-MS): 318