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A	B	C	D	E	F
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M	N	O	P	Q	R
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8-Allylthioguanosine

6-Amino-3-iodo-4-methoxy-1-(b-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidine

6-Amino-2,5-dihydro-2-(b-D-ribofuranosyl)-4H-pyrazolo[3,4-d]pyrimidin-4-one

4,6-Diamino-2-(b-D-ribofuranosyl)-2H-pyrazolo[3,4-d]pyrimidine

6-Amino-4-methoxy-1-(2-deoxy-3,5-di-(O-p-toluoyl)-b-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidine

9-(3-Deoxy-3-fluoro-beta-D-ribofuranosyl)purine

2-Amino-9-(3-deoxy-3-fluoro-beta-D-ribofuranosyl)purine

6-Methylpurine-beta-D-(3-deoxy-3-fluoro)riboside

6-(Furan-2-yl)purine-beta-D-riboside

6-O-Methylinosine; 6-Methoxypurine-9-beta-D-riboside