1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 0 . 86 ( d , J = 6 . 69 Hz , 1 H ) , 0 . 98 - 1 . 33 ( m , 13 H ) , 2 . 02 - 2 . 09 ( m , 1 H ) , 4 . 03 - 4 . 17 ( m , 1 H ) , 4 . 22 - 4 . 50 ( m , 3 H ) , 4 . 81 ( quin , J = 6 . 25 Hz , 1 H ) , 5 . 81 ( br s , 1 H ) , 5 . 93 - 6 . 15 ( m , 2 H ) , 7 . 11 - 7 . 27 ( m , 3 H ) , 7 . 31 - 7 . 41 ( m , 2 H ) , 7 . 77 - 8 . 21 ( m , 1 H )