| http://www.w3.org/ns/prov#value | - Ra, Rb, and Rc can be the same or different and are selected from the group consisting of H, aryl, heteroaryl, biaryl, heterobiaryl, and alkyl (branched, cyclic or unbranched) optionally substituted with a heteroatom or other functional groups such as a carboxylic acid, carboxylic ester, alcohol, ether, thioether, amide, thioamide, urea, urethane, sulfoxide, sulfone, phosphonic acid, phosphonic es
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