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Figure 9
Chain motifs, aligned along the 6 Å screw axis, constituting the helix in HOH1. (a) C(5) carboxyl⋯hydroxyl chain (molecules aligned head-to-head); (b) the same chain, but with the intramolecular hydrogen bond accounted for [the C22(6) carboxyl⋯α-hydroxycarboxyl chain]; (c) C(7) amide⋯carboxyl chain (molecules aligned head-to-tail); (d) the resulting helix, side view (top) and view along the axis of the helix (bottom).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 56| Part 5| October 2000| Pages 833-848
doi:10.1107/S0108768100004274
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