| http://www.w3.org/ns/prov#value | - Preferred groups are methyl or ethyl groups. [0103] ???Hydroxy group protected with a protecting group in nucleic acid synthesis??? described in the above definition of R4a, R4b and ?? group is a similar group to that described previously in the ???protecting group for a hydroxy group in nucleic acid synthesis??? in the above definition of R1.
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