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Figure 6
Stereoview of the close packing of (VIIb) and (VIIIb). The alternating two-dimensional isostructurality is revealed by the antiparallel helices in (VIIIb) versus the parallel helices in (VIIb). In both structures, the enantiomers denoted by 4R are held together by the hydrogen bonds shown in green, whereas the helices with 4S configuration are shown by yellow hydrogen bonds. The antiparallel double helix in (VIIIb) is indicated in blue (4R) and red (4S). (Reproduced from Kálmán et al., 2004BB21.)

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 61| Part 5| September 2005| Pages 536-547
doi:10.1107/S0108768105023189
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