| http://www.w3.org/ns/prov#value | - In one embodiment, R15, R16, R17 and R18 are each independent (C8-C24) branched or linear hydrocarbon groups which may comprise additional functionality such as, for example, fatty acids or derivatives thereof, including esters of fatty acids and fatty acids with alkoxylated groups, alkyl amido groups, aromatic rings, heterocyclic rings, phosphate groups, epoxy groups, and hydroxyl groups.
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