| http://www.w3.org/ns/prov#value | - The present invention is an improvement in or a modification of the invention described above, in that we have found that a class of 3-nitro-??-pyridones of the formula (II): ##STR2## wherein R is hydrogen or an alkyl, aryl, or aralkyl group and Z represents the residue of a cyclooctyl, cycloheptyl, cyclohexyl or cyclopentyl ring, any of which residues may carry substituents, are also active in ma
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