1 H - NMR ( 400 MHz , CDCl 3 ) : δ = 8 . 01 ∼ 7 . 97 ( m , 4 H ) , 7 . 79 ∼ 7 . 72 ( m , 8 H ) , 7 . 67 ∼ 7 . 62 ( m , 4 H ) , 7 . 61 ∼ 7 . 53 ( m , 6 H ) , 7 . 52 ∼ 7 . 47 ( m , 4 H ) , 7 . 44 ∼ 7 . 39 ( m , 4 H ) .