132953-09-4 3-(2-Ethoxyethyl)-2-(1-methylpiperidin-4-yl)-3H-imidazo(4,5-b)pyridine hemitrifumarate 3H-Imidazo(4,5-b)pyridine, 1-(2-ethoxyethyl)-2-(1-methyl-4-piperidinyl)-, (E)-2-butenedioate (2:3)