| http://www.w3.org/ns/prov#value | - where R1 is a protecting group as known in the art, usually methyl or other lower alkyl, or ??-cyanoethyl; and R2 is a substituted primary amine or a secondary amine; including, without limitation, a primary or secondary amine substituted with one or two lower alkyls such as methyl, propyl, isopropyl, butyl, etc., including N((CH(CH3)2)2; N(CH3)2 N(CH2CH3)2; tetrazole, imidazoles, cyclic amines, a
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