1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 0 . 97 - 1 . 38 ( m , 15 H ) , 2 . 96 ( br s , 2 H ) , 4 . 06 - 4 . 18 ( m , 1 H ) , 4 . 19 - 4 . 49 ( m , 3 H ) , 4 . 66 - 4 . 91 ( m , 1 H ) , 5 . 70 - 5 . 95 ( m , 1 H ) , 5 . 96 - 6 . 16 ( m , 2 H ) , 7 . 10 - 7 . 27 ( m , 3 H ) , 7 . 30 - 7 . 43 ( m , 2 H ) , 7 . 88 - 8 . 19 ( m , 1 H )