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The structure of a third pseudopolymorphic hydrate of brucine, brucine–water (1/2) [systematic name: 2,3-dimethoxy­strychnidin-10-one–water (1/2)], C23H26N2O4·2H2O, has been determined at 130 K. The asymmetric unit comprises two independent brucine mol­ecules and four water mol­ecules of solvation. The four water mol­ecules form uncommon cyclic hydrogen-bonded homomolecular R44(8) tetra­mer rings, which then form primary hydrogen-bonded chain substructures extending down the 21 screw axis in the unit cell. The two brucine mol­ecules are linked peripherally to these substructures by either single O—H...Nbrucine or asymmetric three-centre O—H...Obrucine hydrogen bonds.
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