1 H - NMR ( CDCl 3 ) : 7 . 972 ( d , 1 H , J = 7 . 6 Hz ) , 7 . 405 ~ 7 . 322 ( m , 5 H ) , 7 . 012 ( d , 1 H , J = 8 Hz ) , 6 . 941 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 925 ( s , 1 H ) , 6 . 540 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 387 ( d , 1 H , J = 10 Hz ) , 5 . 479 ( d , 1 H , J = 10 Hz ) , 5 . 169 ( s , 2 H ) , 5 . 146 ( s , 2 H ) , 4 . 511 ( d , 2 H , J = 5 . 6 Hz ) , 3 . 608 ( t , 2 H , J = 6 . 4 Hz ) , 3 . 332 ( s , 3 H ) , 3 . 272 ( br , 1 H ) , 2 . 899 ( t , 2 H , J = 6 . 4 Hz ) , 1 . 416 ( s , 6 H )