| http://www.w3.org/ns/prov#value | - R1 and R2 are substituted alkyl and are capable of forming a ring, and at least one of R1 or R2 is a linking group selected from a list of COOH, NH2, maleimide, thiol, isocyanate, isothiocyanate, disulfide, alkynyl, azidoyl, or trialkoxysilane;
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