prov:value
| - 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 conjugate group or a solid support material; each R.sub.1 and R.sub.2 is, independently, H, a nitrogen protecting group, substituted or unsubstituted C.sub.1-C.sub.10 alkyl, substituted or unsu
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