1 H NMR ( 300 MHz , 클로로포름 - d ) δ ppm 1 . 44 ( s , 9 H ) 3 . 54 - 3 . 68 ( m , 2 H ) 3 . 93 ( s , 3 H ) 4 . 44 ( s , 2 H ) 4 . 49 - 4 . 71 ( m , 2 H ) 7 . 01 ( d , J = 8 . 69 Hz , 1 H ) 7 . 45 - 7 . 70 ( m , 5 H ) 7 . 98 ( dd , J = 1 . 00 Hz , 1 H ) 8 . 30 ( d , J = 2 . 27 Hz , 1 H ) 8 . 50 ( s , 1 H ) 8 . 56 ( s , 1 H ) 8 . 73 ( s , 1 H ) .