1 H NMR ( 400 MHz , DMSO - d 6 ) δ [ ppm ] = 1 . 40 - 1 . 54 ( m , 2 H ) , 1 . 66 ( br s , 1 H ) , 1 . 72 - 1 . 90 ( m , 1 H ) , 1 . 94 - 2 . 11 ( m , 2 H ) , 3 . 69 - 3 . 82 ( m , 1 H ) , 3 . 97 ( br s , 1 H ) , 5 . 78 ( d , 1 H ) , 7 . 52 ( d , 2 H ) , 7 . 64 ( dd , 1 H ) , 8 . 08 - 8 . 14 ( m , 2 H ) , 8 . 15 - 8 . 20 ( m , 1 H ) , 8 . 68 - 8 . 72 ( m , 2 H ) , 8 . 92 ( d , 1 H ) , 9 . 52 ( d , 1 H ) .