Novel compounds having the formula: R.sup.1 --OCH.sub.2 CH.sub.2 CH.sub.2 O--(CH.sub.2).sub.n --R.sup.2 wherein R.sup.1 stands for a higher alkyl group; R.sup.2 stands for a primary to tertiary amino group or a quaternary ammonium group; and n denotes an integer of 3 to 10; and salts thereof, have excellent anti-tumor action and therefore are useful as anti-tumor agents.