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A partial packing diagram of compound (II) viewed approximately along the b axis, showing a hydrogen-bonded tape structure formed by acid molecules and pairs of base molecules. O—H⋯O and N—H⋯O hydrogen bonds are shown by light-blue dotted lines. [Symmetry codes: (i) −x + 1, −y + 1, −z + 1; (iii) −x + 
, −y + 
, −z + 1.]
