1 H NMR ( 400 MHz , DMSO - d 6 ) δ [ ppm ] = 0 . 25 - 0 . 32 ( m , 1 H ) , 0 . 32 - 0 . 39 ( m , 1 H ) , 0 . 40 - 0 . 50 ( m , 2 H ) , 1 . 03 - 1 . 13 ( m , 1 H ) , 3 . 45 ( tt , 1 H ) , 3 . 58 ( tq , 2 H ) , 4 . 93 ( t , 1 H ) , 7 . 13 ( t , 1 H ) , 7 . 61 - 7 . 66 ( m , 1 H ) , 7 . 72 ( d , 2 H ) , 8 . 13 ( d , 2 H ) , 8 . 16 - 8 . 21 ( m , 1 H ) , 8 . 70 ( dd , 1 H ) , 8 . 72 ( s , 1 H ) , 8 . 93 ( d , 1 H ) , 9 . 53 ( d , 1 H ) .