| http://www.w3.org/ns/prov#value | - , in which R1 and R2 are hydrogen, and unsubstituted guanine, in which R1 is hydrogen and R2 is amino. [0075] In one particularly preferred embodiment, R1 is butyl and R2 is hydrogen. [0076] In another preferred embodiment, R1 is benzyl and R2 is hydrogen. [0077] In another preferred embodiment, R1 is dimethylaminoethyl and R2 is hydrogen. [0078] In anothe
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