1 H NMR ( 400 MHz , CDCl 3 ) : δ 10 . 41 ( s , 1 H ) , 8 . 52 ( d , J = 8 . 0 Hz , 1 H ) , 7 . 58 ( d , J = 8 . 0 Hz , 1 H ) , 7 . 46 ( m , 1 H ) , 7 . 39 ( m , 1 H ) , 4 . 52 ( t , J = 6 . 0 Hz , 2 H ) , 3 . 80 ( t , J = 6 . 0 Hz , 2 H ) , 3 . 45 ( q , J = 7 . 2 Hz , 2 H ) , 1 . 13 ( t , J = 7 . 2 Hz , 3 H ) ; 13 C NMR ( 100 MHz , CDCl 3 ) : δ 185 . 81 , 137 . 63 , 131 . 27 ( q , J = 37 . 9 Hz ) , 126 . 02 , 124 . 30 , 124 . 21 , 123 . 66 , 121 . 29 ( q , J = 270 . 3 Hz ) , 117 . 84 ( q , J = 1 . 5 Hz ) , 111 . 18 , 68 . 82 , 66 . 93 , 45 . 58 ( q , J = 2 . 5 Hz ) , 14 . 94 ; MS ( MALDI - TOF ) : m / z 286 [ M + H ] +; mp 46 ℃