1 H - NMR ( CDCl 3 ) : 8 . 048 ( d , 1 H , J = 8 . 8 Hz ) , 7 . 388 ~ 7 . 297 ( m , 5 H ) , 6 . 574 ( dd , 1 H , J = 8 . 8 , 2 . 4 Hz ) , 6 . 490 ( d , 1 H , J = 2 Hz ) , 6 . 363 ( d , 1 H , J = 9 . 6 Hz ) , 6 . 206 ( s , 1 H ) , 5 . 345 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 118 ( s , 2 H ) , 5 . 090 ( s , 2 H ) , 4 . 636 ( d , 2 H , J = 5 . 2 Hz ) , 3 . 948 ( t , 2 H , J = 6 . 4 Hz ) , 3 . 782 ( s , 3 H ) , 3 . 054 ( br , 1 H ) , 1 . 811 ~ 1 . 758 ( m , 2 H ) , 1 . 365 ( s , 6 H ) , 1 . 030 ( t , 3 H , J = 7 . 6 Hz )