prov:value
| - kyl, trifluoromethyl, cyanoethyloxy, methoxy, ethoxy, t-butoxy, allyloxy, 9-fluorenylmethoxy, 2-(trimethylsilyl)-ethoxy, 2,2,2-trichloroethoxy, benzyloxy,butyryl, iso-butyryl, phenyl or aryl; R.sub.5 is T--L.sub.1, T is a bond or a linking moiety; L.sub.1 is a chemical functional group, a conjugate group or a solid support material; each R.sub.1 and R.sub.2 is, independently, H, a nitrogen protect
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