mp=168-170 ^oC; ¹H NMR (400 MHz, CDCl₃) δ 7.83 – 7.81 (dd, J = 4.7, 3.7 Hz, 2H), 7.73 – 7.71 (m, 2H), 7.55 – 7.49 (dd, J = 17.5, 7.8 Hz, 3H), 7.39 – 7.35 (m, 2H), 7.33 – 7.29 (m, 1H), 7.00 (d, J = 7.6 Hz, 1H), 6.89 – 6.85 (m, 2H), 4.07 (s, 2H), 3.96 (d, J = 14.2 Hz, 1H), 3.81 (d, J = 14.2 Hz, 1H), 3.18 (s, 3H); ¹³C NMR (100 MHz, CDCl₃) δ: 26.7, 44.1, 49.3, 59.3, 108.6, 122.3, 123.6, 124.8, 125.4, 127.8, 128.8, 129.4, 131.5, 133.3, 134.2, 139.9, 143.8, 167.9, 174.8; HRMS (EI) m/z calcd for C₂₅H₂₀N₂O₅S [M⁺]: 460.1093; found, 460.1088.