1H NMR (400 MHz, CDCl3): δ 8.22 (d, J = 7.8 Hz, 2H), 7.36 (s, 1H), 7.33 – 7.22 (m, 9H), 6.96 (d, J = 7.0 Hz, 2H), 5.73 (s, 2H), 2.54 (s, 3H), 2.52 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3): δ 182.9, 145.4, 143.6, 140.4, 138.5, 137.6, 133.8, 131.2, 129.6, 129.1, 128.6, 127.3, 126.2, 125.9, 124.9, 124.7, 49.2, 15.3, 14.8. HRMS (EI) m/z: calcd for C25H22N2OS2, 430.1174; found, 430.1177.