The novel bicyclic peroxides of the general formula …<IMAGE>… in which R denotes a saturated or partially unsaturated hydrocarbon group having up to 15 carbon atoms or an aryl, heteroaryl, arylcarbonyl or heteroarylcarbonyl group bonded via an alkyl or alkenyl group having up to 7 carbon atoms,… have useful pharmacological properties. They especially exhibit a marked effect against the causative organisms of malaria and can be used for the prevention and control of malaria.
