| http://www.w3.org/ns/prov#value | - A reagent useful in polynucleotide synthesis, having the structure ##STR13## wherein R1 is an acid-sensitive, base-stable protecting group, and R2 is selected from the group consisting of H, phosphoramidite, phosphotriester, phosphodiester, phosphite, H-phosphonate, and phosphonothioate.
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