1 H NMR ( 400 MHz , DMSO - d 6 ) δ 9 . 98 ( s , 1 H ) , 8 . 40 ( d , J = 8 . 4 Hz , 1 H ) , 7 . 78 ( t , J = 8 . 0 Hz , 1 H ) , 7 . 56 ( d , J = 7 . 2 Hz , 1 H ) , 7 . 08 ( d , J = 2 . 0 Hz , 1 H ) , 7 . 01 - 6 . 92 ( m , 2 H ) , 5 . 79 ( dd , J = 10 . 4 , 4 . 4 Hz , 1 H ) , 4 . 35 ( dd , J = 14 . 4 , 10 . 8 Hz , 1 H ) , 4 . 15 ( dd , J = 14 . 4 , 4 . 4 Hz , 1 H ) , 4 . 02 ( q , J = 7 . 2 Hz , 2 H ) , 3 . 02 ( s , 3 H ) , 2 . 00 - 1 . 94 ( m , 1 H ) , 1 . 32 ( t , J = 7 . 2 Hz , 3 H ) , 0 . 90 - 0 . 88 ( m , 4 H ) . LCMS : ( [ M + H ] +) = 490 . 0 .