In the title compound, C 17 H 17 N 3 O 3 ÁH 2 O, the dihedral angle between the 4,6-dimethyl-pyrazolo [3,4-b]pyridine-3-one unit [maximum deviation = 0.048 (2) Å ] and the phenyl ring is 5.1 (1) . The structure is characterized by disorder of the carboxylate O atoms, which are split into two parts with a major component of 0.898 (4). In the crystal, the organic molecules and lattice water molecules are linked via O-HÁ Á ÁO, O-HÁ Á ÁN and N-HÁ Á ÁO hydrogen bonds. The molecules are also linked by C-HÁ Á Á and weak offset -stacking interactions, forming sheets parallel to (001).
Structure descriptionThe number of substituted pyrazolo [3,4-b]pyridines has increased in organic and pharmaceutical chemistry. These heterocyclic systems are found in a number of molecules possessing biological and pharmacological activities such as antimicrobial (Raviraj et al., 2013), anti-inflammatory (Fong &Heymsfield, 2009) and antiviral (Bernardino et al., 2007). Besides their pharmacological properties, pyrazolo [3,4-b]pyridines also exhibit corrosion inhibition properties (Gupta et al., 2015). As part of our research on the preparation of new pyrazolo [3,4-b]pyridine-3-ones (Fadel et al., 2011), the title compound was isolated and its crystal structure was determined by X-ray diffraction.The molecular structure is shown in Fig. 1. The dihedral angle between the 4,6-dimethyl-pyrazolo[3,4-b]pyridine-3-one unit [maximum deviation = 0.048 (2) Å ] and the phenyl ring is 5.1 (1) . In the crystal, the components are linked through O-HÁ Á ÁO, O-