1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 0 . 93 - 1 . 29 ( m , 13 H ) , 2 . 94 ( br s , 3 H ) , 3 . 79 ( td , J = 10 . 04 , 7 . 07 Hz , 2 H ) , 4 . 05 - 4 . 19 ( m , 1 H ) , 4 . 19 - 4 . 50 ( m , 3 H ) , 4 . 81 ( quin , J = 6 . 25 Hz , 1 H ) , 5 . 71 - 5 . 94 ( m , 1 H ) , 5 . 97 - 6 . 16 ( m , 2 H ) , 7 . 14 - 7 . 28 ( m , 3 H ) , 7 . 31 - 7 . 44 ( m , 2 H ) , 7 . 82 - 8 . 09 ( m , 1 H )