1 H NMR ( 400 MHz , DMSO - d 6 ) δ 9 . 94 ( d , J = 0 . 8 Hz , 1 H ) , 8 . 14 ( d , J = 1 . 2 Hz , 1 H ) , 7 . 27 ( d , J = 8 . 0 Hz , 1 H ) , 7 . 06 ( d , J = 8 . 0 Hz , 1 H ) , 5 . 83 ( dd , J = 10 . 8 , 3 . 6 Hz , 1 H ) , 4 . 35 ( dd , J = 14 . 4 , 3 . 6 Hz , 1 H ) , 4 . 22 - 4 . 16 ( m , 3 H ) , 3 . 77 ( s , 3 H ) , 3 . 10 ( s , 3 H ) , 2 . 22 ( s , 3 H ) , 1 . 20 ( t , J = 7 . 2 Hz , 3 H ) . LCMS ( ESI ) [ M + H ] + = 486 . 9 .