(2-((9-Methoxy-7-methyl-5-oxo-5H-furo(3,2-g)(1)benzopyran-4-yl)oxy)ethyl)trimethylammonium theophylline derivate 17243-56-0 Kellofyllin Visnafilina Visnafylline Visnafylline [INN] Visnafyllinum