1 H - NMR . δ ( CDCl 3 ) : 7 . 64 ( d , 1 H , J = 7 . 5 Hz ) , 7 . 59 ( d , 1 H , J = 8 . 0 Hz ) , 7 . 38 - 7 . 43 ( m , 4 H ) , 7 . 29 - 7 . 36 ( m , 8 H ) , 7 . 24 - 7 . 28 ( m , 3 H ) , 7 . 19 ( d , 2 H , J = 8 . 5 Hz ) , 7 . 13 ( dd , 1 H , J = 1 . 5 Hz , 8 . 0 Hz ) , 1 . 47 ( s , 6 H ) , 1 . 32 ( s , 45 H ) .