1 H NMR ( 400 MHz , DMSO - d 6 ) δ [ ppm ] = 1 . 32 ( br s , 2 H ) , 1 . 46 - 1 . 69 ( m , 6 H ) , 3 . 77 ( br s , 1 H ) , 3 . 87 - 3 . 98 ( m , 1 H ) , 4 . 88 ( d , 1 H ) , 7 . 51 ( d , 2 H ) , 7 . 63 ( dd , 1 H ) , 8 . 08 - 8 . 13 ( m , 2 H ) , 8 . 14 - 8 . 19 ( m , 1 H ) , 8 . 67 - 8 . 72 ( m , 2 H ) , 8 . 91 ( d , 1 H ) , 9 . 62 ( d , 1 H ) .