mp=159-161 ^oC; ¹H NMR (400 MHz, CDCl₃) δ 7.54 – 7.47 (m, 3H), 7.38 – 7.34 (m, 2H), 7.29 – 7.25 (m, 1H), 7.01 (d, J= 7.2 Hz, 1H), 6.89 – 6.84 (dd, J = 13.2, 7.6 Hz, 2H), 3.88 (d, J = 14.6 Hz, 1H), 3.71 (d, J = 14.6 Hz, 1H), 3.16 (s, 3H), 1.38 (s, 3H); ¹³C NMR (100 MHz, CDCl₃) δ: 25.3, 26.4, 45.4, 61.7, 108.3, 122.4, 123.9, 127.6, 128.5, 128.7, 129.3, 133.2, 139.7, 143.1, 177.5; HRMS (EI) m/z calcd for C₁₇H₁₇NO₃S [M]⁺: 315.0929, found 315. 0926.