1-(4-(Diethylamino)-2-butynyl)-5-methyl-2-pyrrolidinone ethanedioate (2:3) 112483-20-2 2-Pyrrolidinone, 1-(4-(diethylamino)-2-butynyl)-5-methyl-, ethanedioate (2:3) N-(4-(Diethylamino)-2-butynyl)-5-methyl-2-pyrrolidone sesquioxalate