mp=132-134 oC; 1H NMR (400 MHz, CDCl3) δ 7.38 (d, J = 8.1 Hz, 2H), 7.29 (d, J = 7.7 Hz, 1H), 7.17 (d, J = 8.0 Hz, 2H), 7.09 (d, J = 7.4 Hz, 1H), 6.94 – 6.90 (m, 1H), 6.84 (d, J = 7.8 Hz, 1H), 3.85 (d, J = 14.5 Hz, 1H), 3.66 (d, J = 14.5 Hz, 1H), 3.16 (s, 3H), 2.39 (s, 3H), 1.39 (s, 3H); 13C NMR (100 MHz, CDCl3) δ: 21.5, 25.4, 26.4, 45.6, 61.8, 108.3, 122.4, 124.1, 127.8, 128.5, 129.4, 129.5, 137.0, 143.2, 144.2, 177.6; HRMS (EI) m/z calcd for C18H19NO3S [M+]: 329.1086; found, 329.1081.
