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The structure of the title compound, pentoxifylline, C 13 H 18 N 4 O 3 , has been previously characterized as a triclinic polymorph [Pavelčík  et al.  (1989  ▶ ).  Acta Cryst . C 45 , 836–837]. We have discovered the monoclinic form. There are no strong hydrogen bonds in the crystal structure, rather, moderate C—H⋯O hydrogen bonds are present, which serve to stabilize the three-dimensional architecture.

Monoclinic polymorph of 3,7-dimethyl-1-(5-oxohexyl)-3,7-dihydro-1H-purine-2,6-dione