1 H NMR ( CDCl 3 , 300 MHz ) δ 3 . 32 ( t , 4 H , J = 4 . 5 Hz ) , 3 . 84 ( t , 4 H , J = 3 . 9 Hz ) , 5 . 47 ( s , 2 H ) , 7 . 00 ― 7 . 12 ( m , 3 H ) , 7 . 30 ― 7 . 34 ( m , 5 H ) , 7 . 54 ( s , 5 H ) , 8 . 38 ( s , 1 H ) .