Synthesis of 6-amino-1-(β-D-ribofuranosyl)-1H-pyrazolo[3,4-d]-1,3-oxazin -4-one, isostere of oxanosine, and the guanosine analog 6-amino-1-(β-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin- 4(5H)-one via ring closure of pyrazole-5-thioureido intermediates

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