1 H - NMR ( CDCl 3 ) : 8 . 063 ( d , 1 H , J = 8 . 8 Hz ) , 7 . 35 ~ 7 . 32 ( m , 5 H ) , 7 . 001 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 585 ( dd , 1 H , J = 8 . 8 , 2 . 0 Hz ) , 6 . 532 ( d , 1 H , J = 8 . 0 Hz ) , 6 . 503 ( d , 1 H , J = 2 . 0 Hz ) , 6 . 383 ( d , 1 H , J = 10 Hz ) , 5 . 464 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 092 ( s , 2 H ) , 5 . 065 ( s , 2 H ) , 4 . 522 ( s , 2 H ) , 4 . 078 ( q , 2 H , J = 13 . 6 ) , 3 . 502 ( br , 1 H ) , 1 . 424 ( t , 3 H , J = 6 . 8 Hz ) , 1 . 367 ( s , 6 H ) .