| http://www.w3.org/ns/prov#value | - The pyridine derivatives of general formula I, wherein R1 represents a grouping of the formula: --COOR4, in which R4 represents a hydrogen atom, or an alkyl group containing from 1 to 12 carbon atoms, D represents an alkylene group containing from 2 to 5 carbon atoms branched at ??-position of the carboxy group, B is other than oxygen and sulphur atoms, A represents an alkylene group containing fr
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