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A partial packing diagram of compound (II), showing hydrogen-bonding scheme in the layer formed by base molecules. N—H⋯O hydrogen bonds between the base molecules are shown by light-blue dotted lines, while O—H⋯O hydrogen bonds between the base and acid molecules are shown by red dotted lines. [Symmetry codes: (i) −x + 1, −y + 1, −z + 1; (ii) −x + 
, y + , −z + ; (iv) −x + , y − , −z + .]
