prov:value
| - yls, and groups of the following general formulae: ##STR15## where n is 2 or 3, R2 is a bivalent aliphatic or aromatic radical or a single bond, R3 is a bivalent aliphatic, cycloaliphatic, aromatic radical which may be halogen-substituted, R4 is H or straight-chain or branched alkyl which may be halogen-substituted, and R5 is alkyl, aryl, halogen-substituted alkyl or halogen-substituted aryl,with
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