1H NMR (400 MHz, CDCl3) 1H NMR (400 MHz, CDCl3) δ 7.82 (d, J = 8.7 Hz, 2H), 7.23 (d, J = 7.7 Hz, 1H), 7.14 (d, J= 7.3 Hz, 1H), 6.92 – 6.96 (m, 1H), 6.87 (dd, J = 13.6, 8.3 Hz, 3H), 3.82 (s, 3H), 3.68 (d, J = 17.7 Hz, 1H), 3.60 (d, J = 17.7 Hz, 1H), 3.31 (s, 3H), 1.43 (s, 3H); 13C NMR (100 MHz, CDCl3) δ: 24.9, 26.4, 45.3, 45.6, 55.4, 108.1, 113.5, 121.7, 122.0, 127.7, 129.4, 130.2, 133.8, 143.8, 163.4, 180.7, 194.5; HRMS m/z (EI) calcd for C19H19NO3 [M+]: 309.1365; found 309.1362.