¹H NMR (400 MHz, CDCl₃) δ 8.44 (s, 1H), 7.71 (d, J = 4.2 Hz, 1H), 7.47 (s, 1H), 7.41 (d, J = 4.7 Hz, 1H), 7.33 – 7.23 (m, 3H), 7.17 (s, 1H), 7.06 (s, 1H), 7.00 (d, J = 6.4 Hz, 3H), 5.84 (s, 2H). ¹³C{¹H} NMR (101 MHz, CDCl₃) δ 174.7, 143.2, 141.8, 137.2, 136.0, 135.4, 132.5, 130.4, 128.7, 128.7, 128.3, 127.9, 127.8, 127.8, 127.4, 125.8, 49.3. HRMS (EI) m/z: calcd for C₁₉H₁₄N₂OS₂, 350.0548; found, 350.0550.