| http://www.w3.org/ns/prov#value | - R19, R20, R21, R22, R23 and R24 independently of one another are hydrogen or alkyl having 1-4 C atoms and R25 is a direct bond, --O--, --S--, --SO--, --SO2 --, --CO--, --CH2 --, --C(CF3)2 --, cycloalkylidene having 5-6 ring carbon atoms, phenylene, ##STR21## or a group ##STR22## in which R26 and R27 are alkyl or alkoxy each having 1-6 C atoms, phenyl, benzyl, phenyloxy or benzyloxy and
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