10H-Pyrido(3,2-b)(1,4)benzothiazine-10-carbothioic acid, 8-fluoro-, S-(2-(diisopropylamino)ethyl) ester, maleate 2-(Diisopropylamino)ethyl 8-fluoro-1-azaphenothiazine-10-thiolcarboxylate maleate 63885-97-2