1 H NMR ( 300 MHz , 클로로포름 - d ) δ ppm 1 . 43 ( s , 9 H ) 3 . 92 ( s , 3 H ) 4 . 29 - 4 . 61 ( m , 6 H ) 4 . 83 ( s , 4 H ) 7 . 00 ( d , J = 8 . 69 Hz , 1 H ) 7 . 45 - 7 . 68 ( m , 5 H ) 7 . 98 ( dd , J = 8 . 69 , 2 . 27 Hz , 1 H ) 8 . 29 ( d , J = 2 . 64 Hz , 1 H ) 8 . 50 ( s , 1 H ) 8 . 58 ( d , J = 2 . 27 Hz , 1 H ) 8 . 72 ( s , 1 H )