| http://www.w3.org/ns/prov#value | - R1, R2, R3 and R4 are independently selected from the group consisting of a hydrogen, an alkyl having 1-20 carbons, a cycloalkyl having 3-20 carbons, an aryl, a heteroaryl, an amino, an alkylamino, an arylamino, a thiol and a RGM. RGM is a chemically reactive group described below.
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