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Figure 4
Two views of the helices generated by N—H⋯Cl hydrogen bonding across the 21 screw axis in (4), (3) and (3a) looking perpendicular to [in (a), (b) and (c)] and down [in (d), (e) and (f)] the axis of the helix in the three structures, respectively.

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COMMUNICATIONS
ISSN: 2056-9890
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