view article
Figure 4
(a) Part of the crystal structure of polymorph (Ib)[link], showing the perpendicular orientation of the R22(8) dimers formed by mol­ecules A and B. The inversion relationship is also seen between the pairs of dimers, which form a square-grid network. (b) Part of the crystal structure of polymorph (Ia)[link], showing the helical arrangement of the mol­ecules in the crystal packing. Hydrogen bonds are shown as dashed lines and H atoms not involved in hydrogen bonding have been omitted for clarity.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 71| Part 2| January 2015| Pages 128-135
doi:10.1107/S2053229615000492
Follow Acta Cryst. C
Sign up for e-alerts
E-alerts
Follow Acta Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS