Compounds of the general formula (I) or (IA), wherein Ar1 represents phenyl or naphthyl group-optionally substituted with one or more identical or non-identical, linear or branched C1-4 alkyl groups, linear or branched C1-4 alkoxy group , halogen atom, trifluoromethyl group, cyano group, nitro group, hydroxyl group, C1-2 alkylene dioxy group, amino group, or amino group substituted with one or two identical or non-identical, linear or branched C1-4 alkyl groups； R1 represents hydrogen atom, or C1-4 linear or branched alkyl group； R4, R5, R6a, R6b represents hydrogen atom, or R4 means linear or branched C1-4 alkyl group and R5, R6a and R6b represent hydrogen atom, or R5 means linear or branched C1-4 alkyl group and R4, R6a and R6b represents hydrogen atom, or R6a means linear or branched C1-4 alkyl group and R6b means linear or branched C1-4 alkyl group or hydrogen atom and R5, R4 represents hydrogen atom； Y, Z independently represent linear C1-4 alkylene group - optionally substituted with one or more identical or non-identical, linear or branched C1-4 alkyl groups； Ar2 represents a phenyl, thienyl or furyl group, -substituted optionally with one or more identical or non-identical, linear or branched C1-4 alkyl groups, linear or branched C1-4 alkoxy group, halogen atom, hydroxyl group, cyano group, nitro group, trifluoromethyl group, C1-2 alkylene dioxy group, amino group, or amino group substituted with one or two identical or non-identical, linear or branched C1-4 alkyl groups； or 5- or 6-membered heterocyclic ring containing one, two or three nitrogen atoms, or a nitrogen atom and an oxygen atom, or a nitrogen atom and a sulfur atom - optionally substituted with one or more C1 alkyl groups -4 identical or non-identical, linear or branched, linear or branched C1-4 alkoxy group, hydroxyl group, halogen atom, nitro group, cyano group, trifluoromethyl group, C1-2 dioxy alkylene group, group -NR7R8, -CONR7R8 or -SO2NR7R8 -where R7 and R8 independently mean hydrogen at
