| http://www.w3.org/ns/prov#value | - le, oxygen, nitrogen, or sulfur, or is a chain of at least five carbon atoms which may or may not have such heteroatom; R may be takn together with one or more other R groups to form one or more rings, usually five or six membered rings; R may contain one or more groups which are hydroxy, carboxy, including esters and amides thereof, sulfonic acid, amine including primary, secondary, and tertiary
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