1 H NMR ( 400 MHz , C 6 D 6 ) δ 8 . 14 ( br s , 2 H ) , 7 . 80 ( t , J = 1 . 9 Hz , 2 H ) , 7 . 59 ( d , J = 2 . 5 Hz , 2 H ) , 7 . 36 ( d , J = 2 . 4 Hz , 2 H ) , 7 . 31 ( d , J = 2 . 4 Hz , 2 H ) , 7 . 20 ( dd , J = 8 . 6 , 2 . 5 Hz , 2 H ) , 5 . 70 ( d , J = 8 . 6 Hz , 2 H ) , 4 . 86 ( d , J = 11 . 5 Hz , 2 H ) , 3 . 71 ( d , J = 11 . 5 Hz , 2 H ) , 2 . 71 - 2 . 55 ( m , 4 H ) , 1 . 70 - 1 . 22 ( m , 80 H ) , 0 . 95 - 0 . 88 ( m , 6 H ) , 0 . 70 - 0 . 61 ( m , 12 H ) , - 0 . 03 ( s , 6 H ) .