| http://www.w3.org/ns/prov#value | - from 1 to 2; (t) compounds of the formula wherein R and R are each a member of the group consisting of a hydrogen atom and a C hydrocarbon radical and R is a member of the group consisting of a hydrogen atom and a C hydrocarbon radical; (11) compounds of the formula wherein R is a member of the group consisting of a hydrogen atom and a C hydrocarbon radical, and R is a divalent C hydrocarbon radi
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