1 H - NMR ( 300 MHz , CDCl 3 ) : δ = 7 . 61 ( d , J = 6 . 6 Hz , 1 H ) , 7 . 53 ( d , J = 8 . 1 Hz , 1 H ) , 7 . 37 ( d , J = 7 . 5 Hz , 1 H ) , 7 . 33 - 7 . 17 ( m , 3 H ) , 7 . 12 - 6 . 95 ( m , 9 H ) , 2 . 77 - 2 . 66 ( m , 1 H ) , 2 . 52 - 2 . 39 ( m , 1 H ) , 1 . 96 - 1 . 26 ( m , 37 H ) .