1 H NMR ( 400 MHz , DMSO - d 6 ) δ 10 . 42 ( s , 1 H ) , 8 . 71 ( d , J = 8 . 4 Hz , 1 H ) , 7 . 86 ( t , J = 8 . 0 Hz , 1 H ) , 7 . 62 ( d , J = 7 . 2 Hz , 1 H ) , 7 . 46 ( d , J = 6 . 4 Hz , 2 H ) , 7 . 35 - 7 . 27 ( m , 3 H ) , 7 . 05 ( d , J = 8 . 0 Hz , 1 H ) , 5 . 83 ( dd , J = 10 . 8 , 3 . 6 Hz , 1 H ) , 4 . 69 ( s , 2 H ) , 4 . 36 - 4 . 32 ( m , 1 H ) , 4 . 20 - 4 . 16 ( m , 5 H ) , 3 . 76 ( s , 3 H ) , 3 . 10 ( s , 3 H ) , 1 . 17 ( t , J = 7 . 2 Hz , 3 H ) . LCMS : [ M + H ] + = 568 . 0 .