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In the title compound, C33H38N4O3, the mean planes of the 9H-xanthene unit and spirolactam (nine-atom) core are almost mutually perpendicular at 87.26 (6)°. Intramolecular N—H...O and C—H...N interactions influence the 4-oxopent-2-en-2-ylamino conformation. In the crystal, weak C—H...O hydrogen bonds link the molecules into chains along [001].

In the title compound, C8H6N4O3S, the dihedral angle between the pyrazine rings is 85.04 (1)°. In the crystal, molecules are arranged along the a axis and are linked by C—H...N hydrogen bonds and pyrazine–pyrazine π–π interactions [centroid–centroid distance = 3.800 (1) Å, forming an infinite chain array. The chains are connected by C—H...O(oxide) hydrogen bonds into layers lying parallel to the ab plane. Along the c axis, the layers are stacked and linked through C—H...O(sulfonyl) interactions, forming a three-dimensional network.

In the title molecular salt, C11H10N2O2+·2ClO4−, the complete cation is generated by crystallographic twofold symmetry. The dihedral angle between the pyridyl rings is 67.07 (7)°. The crystal structure features N—H...Cl hydrogen bonds, forming sheets in the ab plane.

In the title complex, {[Cd(CH3COO)2(C11H8N2O)(H2O)]·2H2O}n, the CdII ion adopts an O5N2 pentagonal–bipyramidal coordination geometry with four acetate O atoms and one water O atom at the equatorial sites and two pyridine N atoms at the axial sites. The (pyridin-3-yl)(pyridin-4-yl)methanone ligand acts in a μ2-bridging mode, linking the metal atoms, leading to an infinite chain along [-110]. O—H...O hydrogen bonds involving the lattice water molecules connect these chains into a three-dimensional network.