1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 1 . 00 - 1 . 26 ( m , 13 H ) , 2 . 09 ( s , 3 H ) , 3 . 74 - 3 . 87 ( m , 2 H ) , 4 . 10 ( br d , J = 7 . 70 Hz , 1 H ) , 4 . 22 - 4 . 50 ( m , 3 H ) , 4 . 81 ( quin , J = 6 . 28 Hz , 1 H ) , 5 . 71 - 5 . 90 ( m , 1 H ) , 5 . 96 - 6 . 15 ( m , 2 H ) , 7 . 12 - 7 . 26 ( m , 3 H ) , 7 . 31 - 7 . 41 ( m , 2 H ) , 7 . 79 - 8 . 07 ( m , 1 H )