| http://www.w3.org/ns/prov#value | - aving from about 1 to about 4 carbon atoms; or alternatively wherein R2 and R3 are members of a heterocyclic ring, and R4 and R5 are members of a different heterocyclic ring or are independently selected from group (a) as defined above or group (b) as defined above; wherein R7 is a member selected from the group consisting of hydrocarbyl groups having from about 2 to about 30 carbon atoms, and sub
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