1 H NMR ( 400 MHz , DMSO - d 6 ) δ [ ppm ] = 1 . 39 - 1 . 56 ( m , 2 H ) , 1 . 58 - 1 . 67 ( m , 1 H ) , 1 . 67 - 1 . 76 ( m , 1 H ) , 1 . 77 - 1 . 87 ( m , 1 H ) , 2 . 03 - 2 . 15 ( m , 1 H ) , 3 . 94 ( quin , 1 H ) , 3 . 98 - 4 . 07 ( m , 1 H ) , 4 . 95 ( d , 1 H ) , 7 . 06 ( t , 1 H ) , 7 . 62 - 7 . 67 ( m , 1 H ) , 7 . 84 ( d , 1 H ) , 8 . 19 ( ddd , 1 H ) , 8 . 58 ( dd , 1 H ) , 8 . 70 ( dd , 1 H ) , 8 . 76 ( s , 1 H ) , 8 . 94 ( d , 1 H ) , 9 . 24 - 9 . 29 ( m , 2 H ) .