Abstract
3-Hydroxy-1H-pyrazolo[4,3-c]pyridine, 3-hydroxy-1-phenyl-1H-pyrazolo-[4,3-c]pyridine, 3-hydroxy-1-methyl-1H-pyrazolo[4,3-c]pyridine, and their 5-oxides have been prepared for testing as tumour inhibitors. Lactam-lactim tautomerism in these compounds is discussed.

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