“…1 H NMR (400 MHz, CDCl 3 ) δ 2.42 (s, 3H); 2.95 (t, J = 6.0 Hz, 2H); 3.80 (s, J = 7.6 Hz, 3H); 4.37 (t, J = 6.0 Hz, 2H); 6.33 (d, J = 16.0 Hz, 1H); 6.85 (d, J = 9.2 Hz, 2H); 7.17-7.27 (m, 5H); 7.95 (d, J = 16.0 Hz, 1H); 7.53 (d, J = 7.6 Hz, 1H). 13…”