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Acta Cryst. (2012). C68, o12-o18  [ doi:10.1107/S0108270111050207 ]

Hydrogen-bonded assembly in six closely related pyrazolo­[3,4-b]pyridine derivatives; a simple chain, three types of chains of rings and a complex sheet structure

J. Quiroga, Y. Díaz, J. Cobo and C. Glidewell

Formula: C20H14ClN3O, C21H16ClN3O, C20H13Cl2N3O, C20H13BrClN3O, C21H16ClN3O2 and C20H13ClN4O3

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