A compound selected from the group consisting of an imidazole derivative having the formula CHEM the possible stereochemically isomeric forms, the acid addition salts and the metal salt complexes thereof, wherein: R1 and R2 are, each independently, selected from the group consisting of hydrogen, halo and methyl R3 and R4 are, each independently, selected from the group consisting of C1-C6-lower alkyl and C3-C4-lower alkenyl, or R3 and R4 form, together with the sulfur atoms to which they are attached and the bridging carbon atom, a 5-, 6- or 7-membered ring which is optionally substituted with 1 to 4 C1-C4-lower alkyl groups R5 is a member selected from the group consisting of hydrogen, C1-C4-lower alkyl, 2-propenyl and 2-propynyl and n is 0, 1 or 2, antimicrobial compositions comprising at least one such compound as an active ingredient, a method of combating microorganisms by the use of such compounds and composition and a process of preparing the compounds of formula (I).
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