the desired 5 2 4 diamino pyrimidines including novel compounds the pyrimidine end products are useful as potentiators of sulfonamides and as antibacterial agents application_number US 92164678 A description the term 34 lower alkyl 34 as used herein is intended to denote straight or branched chain alkyl groups having 1 7 carbon atoms most preferably 1 4 carbon atoms e g methyl ethyl propyl isopropyl butyl hexyl heptyl and the like the expression 34 lower alkoxy 34 denotes a straight or branched chain alkoxy group having 1 7 most preferably 1 4 carbon atoms e g methoxy ethoxy propoxy isopropoxy butoxy hexoxy heptoxy and the like the term 34 non conjugated lower alkenyl 34 denotes an unsaturated hydrocarbon group having 3 7 carbon atoms such as 2 propenyl 2 butenyl 2 pentenyl and the like the term 34 lower alkenyl 34 denotes an unsaturated hydrocarbon group having 3 7 carbon atoms such as 1 propenyl 2 propenyl and the like the term 34 aryl 34 denotes preferably phenyl or phenyl bearing independently 1 to 3 substituents from the group consisting of lower alkyl lower alkoxy lower alkenyl or halogen exemplary of such groups are 2 methyl 4 5 dimethoxyphenyl 3 4 dimethoxyphenyl 2 2 propenyl 4 5 dimethoxybenzyl or the like the term 34 halogen 34 denotes bromine chlorine fluorine and iodine preferably chlorine or bromine.