The donor-acceptor-acceptor purine analog: Transformation of 5-aza-7-deaza-1H-isoguanine (=4-aminoimidazo-[1,2-a]-1,3,5-triazin-2(1H)-one) to 2'-deoxy-5-aza-7-deaza-isoguanosine using purine nucleoside phosphorylase

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