viral fungal and bacterial infectious diseases str1 application_number US 6825098 A description the compounds of the invention are represented by structural formula i str2 wherein a 1 and a 2 independently from each other denote a group z ch 2 k nr 39 34 q wherein z is a 4 10 membered mono or bicyclic heterocyclic ring system containing up to four heteroatoms n o s in the ring in which at least one heteroatom is n and wherein the ring is substituted or unsubstituted by one or two c 1 4 alkyl f cl br i c 1 4 alkoxy ch 2 m r 4 oxo oxime o c 1 4 alkyloxime hydroxy n r 3 2 acylamino or aminoacyl groups 8 9 10 membered monocyclic ring systems being excluded r 39 and r 34 are independently hydrogen c 1 4 alkylc o r 4 c 1 4 alkyl or r 39 and r 34 are benzyl which is optionally substituted by one or two c 1 4 alkyl c 1 4 alkoxy f cl i br oh or n r 3 2 q denotes a group str3 wherein b 1 denotes halogen ch 2 m cn ch 2 m 1 r 2 ch 2 m r 3 ch 2 m cor 2 or ch 2 m cor 3 where r 2 denotes or 3 n r 3 2 sr 3 r 3 is independently hydrogen c 1 c 4 alkyl or benzyl c 1 denotes halogen ch.