1H NMR (400 MHz, CDCl3) δ 7.80 (s, 2H), 7.34 (s, 1H), 7.30 – 7.20 (m, 4H), 7.08 (s, 1H), 6.98 (d, J = 11.2 Hz, 4H), 5.73 (s, 2H), 2.41 (s, 6H), 2.32 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 184.8, 143.6, 139.4, 138.4, 137.8, 137.8, 137.5, 134.3, 130.7, 129.1, 128.5, 128.5, 128.4, 127.3, 127.3, 126.3, 49.3, 21.3, 21.2. HRMS (EI) m/z: calcd for C25H22N2OS2, 430.1174; found, 430.1178.