1H NMR (400 MHz, DMSO-d6) δ 8.21 (d, J = 8.9 Hz, 1H), 7.93 (dd, J = 7.7, 1.6 Hz, 1H), 7.57 (d, J = 8.9 Hz, 1H), 7.54 – 7.45 (m, 1H), 7.41 (td, J = 7.5, 1.3 Hz, 1H), 7.18 (dd, J = 7.9, 1.2 Hz, 1H). 13C NMR (101 MHz, DMSO) δ 167.93, 146.88, 144.76, 135.78, 133.03, 132.36, 132.28, 131.58, 131.15, 127.81, 124.92. LCMS m/z: 274 [M-] FTIR (cm-1): 2845.86, 1667.40, 1597.96, 1514.02, 1460.82, 1409.17, 1342.49, 1249.97, 1058.32, 1039.01, 903.06, 851.99