| http://www.w3.org/ns/prov#value | - fter reacting the deprotected compound with an amino acid of the formula Pr3 X2 Rx wherein X2 is as previously described, Pr3 is a protecting group and Rx is a leaving group, so as to covalently link X2 to the pendant amino group, and in the case where the 5'-OH group is free this group is optionally reprotected with a removable protecting group which may be the same as or different from the prote
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