1 H NMR ( 400 MHz , MeOD ) δ 7 . 94 - 7 . 87 ( m , 2 H ) , 7 . 72 ( d , J = 1 . 4 Hz , 1 H ) , 7 . 55 - 7 . 44 ( m , 3 H ) , 7 . 44 - 7 . 33 ( m , 2 H ) , 7 . 21 ( s , 1 H ) , 7 . 05 ( dt , J = 8 . 8 , 7 . 4 Hz , 1 H ) , 6 . 58 ( td , J = 8 . 6 , 2 . 5 Hz , 1 H ) , 6 . 53 - 6 . 42 ( m , 2 H ) .