Patent ID: 8168793

Claim:
A compound of formula (I): wherein R 1 and R 2 are independently from each other hydrogen, optionally substituted lower alkanoyl or aroyl; X represents a methylene group; Y represents an atom of oxygen, NH or sulphur; n represents the number 0, 1, 2 or 3 and m represents the number 0 or 1; R 3 represents a pyridine N-oxide group according to the formula A, B or C, which is connected as indicated by the unmarked bond: where R 4 , R 5 , R 6 and R 7 independently from each other represent hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -thioalkyl, C 1 -C 6 -alkoxy, C 6 -C 12 -aryloxy or a C 6 -C 12 -thioaryl group, C 1 -C 6 -alkanoyl or C 7 -C 13 -aroyl group, amino, C 1 -C 6 -alkylamino, C 3 -C 12 -cycloalkylamino or C 3 -C 12 -heterocycloalkylamino, C 1 -C 6 -alkylsulphonyl or C 6 -C 12 -arylsulphonyl, halogen, C 1 -C 6 -haloalkyl, trifluoromethyl, cyano, nitro or a heteroaryl group; or where two or more of residues R 4 , R 5 , R 6 and R 7 taken together represent aliphatic or heteroaliphatic rings or aromatic or heteroaromatic rings; and wherein P represents a central unit selected from the regioisomers of 1,3,4-oxadiazol-2,5-diyl and 1,2,4-oxadiazol-3,5-diyl, wherein the regioisomers of the central unit include both regioisomers realizable by exchange of the nitrocatechol moiety and the —(X) n —(Y) m —R 3 moiety.