¹H NMR (400 MHz, CDCl₃) δ 7.68 (dd, J = 3.7, 1.1 Hz, 1H), 7.59 (dd, J = 4.9, 1.1 Hz, 1H), 7.09 (dd, J = 4.9, 3.7 Hz, 1H), 2.85 (t, J = 7.3 Hz, 2H), 1.84-1.69 (m, 2H), 0.98 (t, J = 7.4 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 193.2, 144.4, 133.2, 131.6, 127.9, 41.2, 18.1, 13.7。