¹H NMR (400 MHz, CDCl₃) δ 7.86 (td, J = 7.6, 1.9 Hz, 1H), 7.50 (dddd, J = 8.2, 7.0, 5.0, 1.9 Hz, 1H), 7.21 (td, J = 7.6, 1.1 Hz, 1H), 7.12 (ddd, J = 11.3, 8.3, 1.0 Hz, 1H), 3.00 (qd, J = 7.2, 3.1 Hz, 2H), 1.20 (td, J = 7.2, 0.8 Hz, 3H). ¹³C{H}NMR (101 MHz, CDCl₃) δ 199.2 (d, J = 4.3 Hz), 161.9 (d, J = 254.3 Hz), 134.2 (d, J = 9.0 Hz), 130.6 (d, J = 2.9 Hz), 125.7, 124.4 (d, J = 3.5 Hz), 116.6 (d, J = 24.0 Hz), 36.8 (d, J = 7.4 Hz), 8.0 (d, J = 2.2 Hz)。