| http://www.w3.org/ns/prov#value | - The nucleoside phosphoroamidite is represented by the following formula: ##STR1## wherein the base is adenine, guanine, thymine, or cytosine, R1 is a protecting group which makes the 5' hydroxyl group unavailable for reaction and includes dimethoxytrityl, tert-butyloxycarbonyl or any of the protecting groups previously identified; R2 is cyanoethyl, methyl, t-butyl, trimethylsilyl and the like and
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