1 H NMR ( 400 MHz , DMSO - d 6 ) : δ ppm 11 . 85 ( s , 1 H ) , 10 . 92 ( s , 1 H ) , 9 . 16 ( s , 1 H ) , 8 . 77 - 8 . 75 ( m , 1 H ) , 8 . 38 - 8 . 35 ( m , 1 H ) , 8 . 05 ( d , J = 8 . 8 Hz , 1 H ) , 7 . 95 - 7 . 90 ( m , 2 H ) , 7 . 82 - 7 . 79 ( m , 1 H ) , 7 . 72 - 7 . 57 ( m , 2 H ) , 7 . 56 - 7 . 54 ( m , 1 H ) , 6 . 55 ( s , 1 H ) . ( ESI ) : m / z 382 . 9 [ M + H ] +.