1 H NMR ( 400 MHz , CDCl 3 ) δ 7 . 05 ( d , J = 8 . 4 Hz , 1 H ) , 6 . 93 ( d , J = 2 . 8 Hz , 1 H ) , 6 . 83 ( dd , J = 8 . 4 , 2 . 8 Hz , 1 H ) , 5 . 76 및 5 . 74 ( AB q , J = 6 . 8 Hz , 2 H ) , 3 . 15 - 3 . 06 ( m , 2 H ) , 2 . 77 - 2 . 67 ( m , 2 H ) , 2 . 63 - 2 . 55 ( m , 2 H ) , 2 . 28 ( d , J = 13 . 2 Hz , 1 H ) , 1 . 79 - 1 . 74 ( m , 1 H ) , 1 . 66 - 1 . 50 ( m , 3 H ) , 1 . 39 - 1 . 26 ( m , 5 H ) , 1 . 18 ( d , J = 6 . 8 Hz , 6 H ) , 1 . 05 - 1 . 01 ( m , 1 H ) .