prov:value
| - B is a nucleobase, generally adenine (A), thymine (T), cytosine (C), guanine (G) or uracil (U), and may be a protected form thereof, e.g., wherein the base is protected with a protecting group such as acetyl, difluoroacetyl, trifluoroacetyl, isobutyryl or benzoyl, or B may be a purine or pyrimidine analog.
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