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A view of a three-dimensional hydrogen-bonding networks assembled by the classical chains above and the nonclassical ones parallel to the b axis. [Symmetry code: (ii) 1/2 - x, -y, z + 1/2; (iii) -x, y + 1/2, 3/2 - z; (iv) -x, y - 1/2, 3/2 - z]
