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n4google.
isaphttp://webisa.webdatacommons.org/prov/
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xsdhhttp://www.w3.org/2001/XMLSchema#
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isa:219445847
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Among the compounds of the formula (XII), those wherein A1 is --NH2 are preferred. ##STR10## wherein each of R2' and R3' is an alkyl group, COR6 (wherein R6 is an alkyl group or an alkoxy group) or --SO2 R6 (wherein R6 is as defined above), provided that either one of R2' and R3' is --COR6, --SO2 R6, and R1 and A1 are as defined above.
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isa:219445847