| http://www.w3.org/ns/prov#value | - a chain from 0 to about 20 backbone atoms including carbon, oxygen, sulfur, nitrogen and mixtures thereof covalently bonded to R1 and X; each R3 is hydrogen (H) such that the terminal group is NH2, or is an acyl group with a linear or branched C1 to C17 alkyl, aryl, heteroaryl, alkene, alkenyl or aralkyl chain including an N-terminus NH2, NH3 +, or NH group or a corresponding acylated derivative;
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