Provided herein are novel cationic lipids, compositions comprising the cationic lipids, and methods of using the cationic lipids. In some claims, the cationic lipids have cytotoxic activity and can be used alone or in combination with a cytotoxic bioactive compound to kill a cell. In some of these claims, the cationic lipid enhances the cytotoxic activity of the cytotoxic bioactive compound. Methods for treating a subject afflicted with a disease or unwanted condition are provided, wherein the method comprises administering a delivery system comprising a novel cationic lipid to the subject. The invention further provides methods for making delivery systems comprising the novel cationic lipids of the invention.
