1H-NMR (500 MHz, CDCl3) δ 8。58 (d, J = 7。2 Hz, 1H), 8。49 (d, J = 8。5 Hz, 1H), 8。34 (d, J = 7。8 Hz, 1H), 7。98 (d, J = 7。9 Hz, 1H), 7。77 (t, J = 7。5 Hz, 1H), 4。20 (t,J = 7。5 Hz, 2H), 1。68-1。61 (m, 2H), 1。43-1。34 (m, 2H), 0。92 (t, J = 7。4 Hz, 3H)。