1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 0 . 97 - 1 . 16 ( m , 16 H ) , 1 . 21 ( d , J = 7 . 07 Hz , 3 H ) , 2 . 87 ( br s , 3 H ) , 3 . 08 ( s , 2 H ) , 3 . 79 ( br d , J = 7 . 07 Hz , 1 H ) , 4 . 08 ( br d , J = 7 . 58 Hz , 1 H ) , 4 . 17 - 4 . 55 ( m , 3 H ) , 4 . 81 ( quin , J = 6 . 25 Hz , 1 H ) , 5 . 78 ( br s , 1 H ) , 5 . 91 - 6 . 15 ( m , 4 H ) , 7 . 10 - 7 . 26 ( m , 3 H ) , 7 . 26 - 7 . 44 ( m , 3 H ) , 7 . 81 ( s , 1 H )