| http://www.w3.org/ns/prov#value | - R1 is an optionally substituted group selected from the group consisting of C1-C18 alkyl; C2-C18 alkenyl; polyethyleneglycol; aryl; cycloalkyl; heterocyclyl and heteroaryl, wherein said heterocyclyl and heteroaryl include one or more heteroatoms and wherein the heteroatoms are selected from N, O and S; R1a is hydrogen or R1; or R1 R1a together with the nitrogen atom to which they are attached form
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