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

Abstract

The structure of the title compound, pentoxifylline, C13H 18N4O3, has been previously characterized as a triclinic polymorph [Pavelčík et al. (1989). Acta Cryst. C45, 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. © Stepanovs and Mishnev 2011.