HIV replication inhibitors of formulapharmaceutically acceptable addition salts; or stereochemically isomeric forms thereof, wherein R1 is halo; R2 and R3 each independently are C1-6alkyl; pharmaceutical compositions containing these compounds as active ingredient and processes for preparing these compounds and compositions. The method provides for the removal of heavy sulfur compounds including disulfides and mercaptans from pre-treated olefinic hydrocarbon feedstocks used in cumene synthesis to improve the life and efficiency of catalysts used in the cumene manufacturing process. Thus, capacitance of the bypass capacitors can be regulated without being affected by the magnetic-field bypass coupling between the non-adjacent resonators.