Theophylline, 5-fluorouracil and water molecules are packed in parallel sheets in the crystal structure of the title compound, 3,7-dihydro-1,3-dimethyl-1H-purine-2,6-dione-5-fluoro-2,4(1H,3H)-pyrimidinedione-water (2/1/1), 2C 7 H 8 N 4 O 2 .C 4 H 3 FN 2 O 2 .H 2 O. The planar molecules are held together within the sheets by hydrogen bonds which include C-H...O interactions. Short linear N-CH 3 ...F and N-CH 3 ...O contacts are also found between molecules within the sheets.
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Zaitu et al. (1995) studied this question.