A method of treating an anthrax infection wherein a compound of formula IwhereinR1 and R2 represent, independently of one another unsubstituted or specifically substituted C1-4alkoxy andR3 represents hydrogen cyano unsubstituted or specifically substituted C1-6alkyl C3-6cycloalkyl C2-6alkenyl C7-18bicyclyl aryl, aryl-C1-4alkyl, aryl-Q-C1-4alkyl heteroaryl, heterocyclyl or heterocyclyl-C1-6alkyl,wherein aryl denotes a mono- or poly-nucleous group with 6 to 14 ring carbon atomsheterocyclyl denotes a 4- to 6-membered non-aromatic heterocyclic group comprising 1 to 3, nitrogen, oxygen and/or sulfur atoms heteroaryl denotes a mono- or polynuclear heteroaromatic group consisting 5- and/or 6-membered rings and comprising 5 to 13 carbon atoms and 1 to 4, nitrogen, oxygen and/or sulfur atoms and Q means —SO— or —SO2—or a pharmaceutically acceptable salt, solvate or hydrate or a prodrug thereofis administered to said subject in a quantity effective to inhibit, suppress, or expel an anthrax infection in said subject.
