1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 0 . 81 - 1 . 11 ( m , 13 H ) , 1 . 19 ( s , 1 H ) , 1 . 53 - 1 . 66 ( m , 1 H ) , 3 . 87 - 4 . 01 ( m , 1 H ) , 4 . 06 - 4 . 32 ( m , 3 H ) , 4 . 64 ( quin , J = 6 . 25 Hz , 1 H ) , 5 . 55 - 5 . 75 ( m , 1 H ) , 5 . 77 - 5 . 97 ( m , 2 H ) , 6 . 94 - 7 . 10 ( m , 3 H ) , 7 . 13 - 7 . 26 ( m , 2 H ) , 7 . 66 - 7 . 96 ( m , 1 H )