1 H NMR ( 400 MHz , C 6 D 6 ) δ 8 . 07 ( br s , 2 H ) , 7 . 65 ( t , J = 1 . 8 Hz , 2 H ) , 7 . 19 ( d , J = 2 . 4 Hz , 2 H ) , 7 . 02 ( dd , J = 9 . 1 , 3 . 1 Hz , 2 H ) , 6 . 87 - 6 . 77 ( m , 4 H ) , 5 . 58 - 5 . 47 ( m , 2 H ) , 4 . 73 ( d , J = 11 . 7 Hz , 2 H ) , 3 . 54 ( d , J = 11 . 6 Hz , 2 H ) , 2 . 18 ( s , 6 H ) , 1 . 37 ( s , 36 H ) , 0 . 62 - 0 . 53 ( m , 12 H ) , 0 . 53 - 0 . 42 ( m , 2 H ) , 0 . 05 ( s , 6 H ) . 19 F { 1 H } NMR ( 376 MHz , CDCl 3 ) δ - 116 . 57 ( m , 2 F ) .