We have synthesized five new cholesterol based gemini cationic lipids possessing hydroxyethyl (-CH2CH2OH) function on each head group, which differ in the length of the polymethylene spacer chain. These gemini lipids are important for gene delivery processes as they possess pre-optimized molecular features, eg, cholesterol backbone, ether linkage and a variable spacer chain between both the headgroups of the gemini lipids. Cationic ...