1 H NMR ( 600 MHz , CDCl 3 ) δ = 8 . 54 ( d , J = 6 . 0 Hz , 2 H ) , 7 . 64 ( t , J = 6 . 0 Hz , 1 H ) , 7 . 37 - 7 . 29 ( m , 5 H ) , 6 . 81 - 6 . 78 ( m , 3 H ) , 4 . 86 - 4 . 80 ( m , 1 H ) , 4 . 11 - 4 . 08 ( m , 2 H ) , 4 . 06 - 4 . 01 ( m , 3 H ) , 3 . 78 - 3 . 83 ( m , 2 H ) , 3 . 61 - 3 . 71 ( m , 1 H )