1-(4-(Ethylmethylamino)-2-butynyl)-5-methyl-2-pyrrolidinone ethanedioate (2:3) 112483-27-9 2-Pyrrolidinone, 1-(4-(ethylmethylamino)-2-butynyl)-5-methyl-, ethanedioate (2:3) N-(4-(Ethylmethylamino)-2-butynyl)-5-methyl-2-pyrrolidone sesquioxalate