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- [49] Four N7-benzyl-substituted 4,5,6,7-tetrahydro-1H-pyrazolo[3,4-b]pyridine-5-spiro-1′-cyclohexane-2′,6′-diones as ethanol hemisolvates: similar molecular constitutions but different crystal structures ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY, 2008, 64 : O637 - O642