| http://www.w3.org/ns/prov#value | - tramolecularly covalently bonded to each other and to the same dioxycarbon atom to form a heterocyclic ring or a heterocyclic ring substituted with an alkyl, alkoxy or alkenyl when R2 is an alkyleneoxy or alkenyleneoxy and R3 is an alkyleneoxy, alkenyleneoxy or alkylene; c) R1 is divalent when R2 and R3 are intramolecularly covalently bonded to each other and to the same dioxy carbon atom to form
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