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(2007/10/02)3-methoxy-6-methylthio-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)pyrazolo<3,4-d>pyrimidin-4(5H)-one
6-amino-3-methoxy-l-β-D-ribofuranosylpyrazolo<3,4-d>pyrimidin-4(5H)-one
3-methoxy-6-methylthio-1H-pyrazolo<3,4-d>pyrimidin-4(5H)-one
6-amino-1-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)pyrazolo<3,4-d>pyrimidine-3,4(2H,5H)-dione
6-amino-3-methoxy-1-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)pyrazolo<3,4-d>pyrimidine-4(5H)-one