1H NMR (400 MHz, CDCl3) δ 7.48 (d, J = 8.1 Hz, 4H), 6.87 (d, J = 8.1 Hz, 4H), 3.83 (s, 6H), 3.59 (t, J = 7.1 Hz, 2H), 1.73 – 1.66 (m, 2H), 0.96 (t, J = 7.3 Hz, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 171.4, 160.6, 134.0, 131.4, 121.4, 114.1, 55.3, 39.9, 22.0, 11.4. HRMS (EI) m/z: calcd for C21H21NO4, 351.1471; found, 351.1474.