| http://www.w3.org/ns/prov#value | - A more general chemical structure is: where R13, R14, R15, R16, R17 and R18 are each independently selected from the group of hydrogen and monovalent hydrocarbon radicals having from one to sixty carbon atoms, Qm is a di- or trivalent hydrocarbon radical having from one to sixty carbon atoms, Qn is a divalent hydrocarbon radical having from one to sixty carbon atoms with the subscripts m and n ind
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