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Figure 4.
Figure 4. Conformations of the cycloheptanone ring system
viewed along the carbonyl axis. The isomers (E,E) (A, twisted)
and (Z,Z) (B, chair) show a C[2] point symmetry with opposing
twists of the ring, whereas isomer (E,Z) (C, asymmetric boat)
lacks rotational symmetry. The carbonyl C1, C2 and C7 atoms are
coloured silver.
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