| http://www.w3.org/ns/prov#value | - each R41 and each R42 is independently H, C1-C10 alkyl, a nitogen protecting group, or R41 and R42 taken together form a nitrogen protecting group; or R41 and R42 taken together with the N or C atom to which they are attached form a ring structure that can include at least one heterotom selected from N and O; [0187] B is a nucleobase; [0188] M is an optionally protected internucleoside linkage; [0
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