| http://www.w3.org/ns/prov#value | - wherein each of R3, R4 and R 5 are independently hydrogen, hydrocarbyl, aminohydrocarbyl, hydroxyhydrocarbyl, or hydroxyhydrocarbyloxyhydrocarbyl groups or R3 and R4 may be hydrocarbyl groups joined together to form a ring including the nitrogen atom, and optionally, oxygen, sulfur, phosphorus or other nitrogen atoms.
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