1H NMR (400 MHz, CDCl3) δ 8.05 (dd, J = 13.7, 7.6 Hz, 4H), 7.61 (d, J = 6.8 Hz, 1H), 7.53 (t, J = 7.1 Hz, 2H), 7.48 (t, J = 7.1 Hz, 2H), 7.43 – 7.37 (m, 1H), 7.35 (s, 1H), 2.48 (s, 3H). 13C NMR (101 MHz, CDCl3): δ 181.8, 153.8, 150.3, 137.2, 132.6, 129.5, 129.3, 129.1, 128.7, 128.5, 126.5, 124.1, 118.1, 18.1. HRMS (EI): calcd for C18H14O2S: 294.0715; found: 294.0718.