| http://www.w3.org/ns/prov#value | - Wherein R1 and R2 are substituted alkyl and may form 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; A is NRa, S, O, Ra???C???Rb, wherein Ra and Rb are substituted or unsubstituted alkyl groups capable of forming a ring; Rc is hydrogen or SO3-, aryl, alkyl, alkox
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