| http://www.w3.org/ns/prov#value | - tly, substituted or unsubstituted C1-C10 alkyl, trifluoromethyl, cyanoethyloxy, methoxy, ethoxy, t-butoxy, allyloxy, 9-fluorenylmethoxy, 2-(trimethylsilyl)-ethoxy, 2,2,2-trichloroethoxy, benzyloxy, butyryl, iso-butyryl, phenyl or aryl; Rk is hydrogen, a nitrogen protecting group or ???Rx???Ry; Rp is hydrogen, a nitrogen protecting group or ???Rx???Ry; Rx is a bond or a linking moiety; Ry is a chem
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