Figure 2 Part of the crystal structure of (I), showing the formation of [R_{2}^{2}](8), [R_{1}^{2}](4), [R_{2}^{1}](6) and [R_{3}^{3}](9) rings. Hydrogen bonds are shown as dashed lines. Hydrogen atoms not involved in the motif have been omitted for clarity.  [article HTML]