1 H NMR ( 600 MHz , DMSO - d 6 ) δ = 9 . 13 ( t , J = 6 Hz , 1 H ) , 7 . 76 ( d , J = 4 Hz , 1 H ) , 7 . 68 ( d , J = 9 Hz , 2 H ) , 7 . 52 ( d , J = 9 Hz , 2 H ) , 7 . 20 ( d , J = 4 Hz , 1 H ) , 4 . 90 - 4 . 82 ( m , 1 H ) , 4 . 26 - 4 . 13 ( m , 3 H ) , 3 . 91 ( dd , J = 9 , 6 Hz , 1 H ) , 3 . 82 ( t , J = 10 . 2 Hz , 2 H ) , 3 . 66 - 3 . 56 ( m , 2 H ) , 1 . 63 - 1 . 56 ( m , 1 H ) , 1 . 28 - 1 . 20 ( m , 2 H ) , 1 . 17 - 1 . 10 ( m , 2 H )