| http://www.w3.org/ns/prov#value | - In one embodiment of the invention, novel reagents are provided which are photolabile chemical compounds having the structure: ##STR1## wherein R1 is a base-stable, acid-sensitive blocking group, R2 is a phosphorus derivative selected to enable addition of the reagent to the 5' position of a nucleoside or an oligonucleotide chain, and one of x and y is zero while the other is an integer in the ran
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