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Figure 5
Differences in the packing of the N—H⋯Cl linked helices in structures of (a) (4) (the helix of the S-isomer is dark purple and that of the R-isomer is light purple), (b) (3) and (c) (3a) (acetone included is shown in blue). All are shown with the 21 screw axis (marked) in the plane of the paper.

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COMMUNICATIONS
ISSN: 2056-9890
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