>From a high resolution X-ray study we have detailed geometry of a seven >membered ring which is a feature of a modified steroid. The same compound has been studied by NMR and the particular 7-membered ring has been described as having a different conformation from the X-ray structure. The NMR measurements have provided torsion angles with respect to the CH2 groups in the ring. These are vicinal torsion angles of the type H-C-C-H and there are six of them in total. We would like to modify the vicinal torsion angles of the X-ray conformation in order to transform the ring conformation to that found in solution from NMR. It was suggested that it may be possible to do this with PyMOL but so far our efforts have not proved successful. Does any one know how to do this? Help with this would be most appreciated as we would very much like to study the detailed solution conformation of the ring which is not presented in the NMR paper.
Rex Palmer Brkbeck College London
