the N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein n represents an integer being 1 or 2; R1 and R2 each independently represents hydrogen C1-4alkyl, NR9R10, C1-4alkyloxy; or R1 and R2 taken together with the carbon atom with which they are attached form a C3-6cycloalkyl; and where n is 2, either R1 or R2 may be absent to form an unsaturated bond; R3 represents a C6-12cycloalkyl, preferably selected from cylo-octanyl and cyclohexyl or R3 represents a monovalent radical having one of the following formulae