1 H - NMR . δ ( CDCl 3 ) : 7 . 63 ( d , 1 H , J = 7 . 5 Hz ) , 7 . 57 ( d , 1 H , J = 8 . 0 Hz ) , 7 . 44 - 7 . 49 ( m , 2 H ) , 7 . 37 - 7 . 42 ( m , 4 H ) , 7 . 31 ( td , 1 H , J = 7 . 5 Hz , 2 . 0 Hz ) , 7 . 23 - 7 . 27 ( m , 2 H ) , 7 . 15 - 7 . 19 ( m , 2 H ) , 7 . 08 - 7 . 14 ( m , 4 H ) , 7 . 05 ( dd , 1 H , J = 8 . 0 Hz , 2 . 0 Hz ) , 2 . 43 - 2 . 53 ( brm , 1 H ) , 1 . 81 - 1 . 96 ( m , 4 H ) , 1 . 75 ( d , 1 H , J = 12 . 5 Hz ) , 1 . 32 - 1 . 48 ( m , 28 H ) , 1 . 20 - 1 . 31 ( brm , 1 H ) .