1H NMR (400 MHz, CDCl3): δ 7.79-7.74 (m, 2H), 7.67-7.60 (m, 4H), 7.57 (t, J = 6.4 Hz, 2H), 7.30 (s, 1H), 2.33 (s, 3H). 13C NMR (100 MHz, CDCl3): δ 182.4, 153.6, 151.3, 136.4, 132.2, 131.5, 131.3, 130.3, 130.0, 129.6, 129.3, 128.4, 127.0 (q, J = 5.1 Hz), 126.7 (dd, J = 9.5, 4.7 Hz), 124.9, 124.7, 122.7, 122.1, 120.8, 18.0. HRMS (EI): calcd for C20H12F6O2S: 430.0462; found, 430.0459.