1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 1 . 02 - 1 . 31 ( m , 15 H ) , 2 . 94 ( br s , 3 H ) , 3 . 79 ( br d , J = 7 . 20 Hz , 2 H ) , 4 . 09 ( br s , 1 H ) , 4 . 22 - 4 . 48 ( m , 3 H ) , 4 . 72 - 4 . 90 ( m , 1 H ) , 5 . 71 - 5 . 92 ( m , 1 H ) , 6 . 07 ( br d , J = 19 . 07 Hz , 2 H ) , 7 . 12 - 7 . 28 ( m , 3 H ) , 7 . 31 - 7 . 44 ( m , 2 H ) , 7 . 75 - 8 . 19 ( m , 1 H ) .