1 H NMR ( δ in CDCl 3 ) : 0 . 3 - 0 . 39 ( m , 9 H ) , 0 . 45 - 1 . 1 ( m , 38 H ) , 2 . 03 - 2 . 21 ( m , 4 H ) , 7 . 51 - 7 . 53 ( d , 1 H , J = 1 . 9 Hz ) , 7 . 6 ( s , 1 H ) , 7 . 77 - 7 . 79 ( d , 1 H , J = 0 . 9 Hz ) , 7 . 89 - 7 . 86 ( d , 1 H , J = 0 . 5 Hz ) , 8 . 25 - 8 . 26 ( d , 2 H , J = 5 . 7 Hz ) .