| http://www.w3.org/ns/prov#value | - cyclic, R6 is phenyl, napthyl, an alkyl group having from 1 to 24 carbon atoms, substituted phenyl, substituted napthyl, phenylalkyl or napthylalkyl, R7 has the structure ##STR9## wherein R4 is a divalent radical selected from the group consisting of alkylene, alkylene ester, arylene and alkylene ether, and R3 is hydrogen, an alkyl group of 1 to 4 carbon atoms, --CH???CH2, or --R5 --CH???CH2 where
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