| http://www.w3.org/ns/prov#value | - nder conditions which may or may not remove Pr2 and thereafter reacting the deprotected compound with a compound 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, to give: ##STR8## and in the case where the 5'-OH group is free this group is optionally reprotected with Pr2 a re
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