1H NMR (400 MHz, CDCl3) δ 7.95 (d, J = 13.7 Hz, 1H), 7.56 (d, J = 13.7 Hz, 1H), 7.51-7.46 (m, 2H), 7.45 – 7.37 (m, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 138.21, 137.63, 137.33, 130.22, 129.66, 128.45. GC-MS (m/z): 183 [M]+.