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The title compound, C14H14BrNO5, has two chiral C atoms. The quaternary C atom in the oxolanone ring has an S configuration, while the adjacent tertiary C atom has an R configuration. The oxolanone ring adopts an envelope conformation, with the flap C atom lying 0.298 (3) Å from the mean plane of the remaining four atoms. In the crystal, mol­ecules are connected into chains along [010] via weak C—H...O hydrogen bonds.

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In the title compound, [Cu(C11H9N6)2(H2O)2]n, the CuII atom lies on an inversion center and is coordinated by four N atoms from four 5-[4-(1H-imidazol-1-ylmethyl)phen­yl]tetra­zolate ligands and two water mol­ecules in a distorted octa­hedral geometry. The ligands bridge the CuII atoms, leading to the formation of a two-dimensional network parallel to (100). The structure is further stabilized by O—H...N hydrogen bonds within the network.
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