1 H NMR ( 300 MHz , 클로로포름 - d ) δ ppm 1 . 44 ( s , 9 H ) 3 . 63 - 3 . 79 ( m , 8 H ) 3 . 93 ( s , 3 H ) 4 . 44 ( s , 2 H ) 7 . 05 ( d , 1 H ) 7 . 45 - 7 . 69 ( m , 5 H ) 7 . 75 - 7 . 82 ( d , 1 H ) 8 . 29 ( d , J = 2 . 64 Hz , 1 H ) 8 . 43 ( s , 1 H ) 8 . 54 ( s , 1 H ) 8 . 68 ( s , 1 H ) .