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. |