1 H NMR ( 400 MHz , CD 3 OD ) δ 8 . 18 ( t , J = 1 . 5 Hz , 1 H ) , 8 . 09 ( d , J = 2 . 6 Hz , 1 H ) , 8 . 01 - 7 . 90 ( m , 3 H ) , 7 . 82 - 7 . 75 ( m , 1 H ) , 7 . 68 ( dd , J = 7 . 5 , 1 . 8 Hz , 1 H ) , 7 . 55 ( t , J = 7 . 8 Hz , 1 H ) , 7 . 29 ( d , J = 9 . 1 Hz , 1 H ) , 6 . 68 ( dd , J = 7 . 5 , 5 . 1 Hz , 1 H ) , 4 . 91 - 4 . 89 ( m , 1 H ) , 3 . 37 - 3 . 23 ( m , 4 H ) , 2 . 89 ( s , 3 H ) , 2 . 39 - 2 . 08 ( m , 4 H ) . LR - MS ( ESI ) m / z 495 ( M + 1 ) .