1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 7 . 52 ( d , J = 8 . 0 Hz , 2 H ) , 7 . 00 ( dd , J = 11 . 2 , 7 . 8 Hz , 4 H ) , 4 . 44 ( s , 1 H ) , 4 . 27 ( s , 1 H ) , 4 . 17 - 4 . 01 ( m , 2 H ) , 3 . 90 ( d , J = 13 . 2 Hz , 1 H ) , 3 . 71 ( t , J = 5 . 9 Hz , 8 H ) , 2 . 82 ( d , J = 7 . 8 Hz , 2 H ) , 2 . 77 - 2 . 67 ( m , 1 H ) , 1 . 17 ( s , 3 H ) , 1 . 14 ( s , 3 H ) , 1 . 11 ( s , 3 H ) , 1 . 02 ( s , 3 H ) .