*** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.ccp4.ac.uk *** Sorry. I meant to say CHAIR conformation ! "free" dioxane displayed the chair conformation. See for instance "neat" dioxane CUKCIU01 !! J. Buschmann, E. Muller , P Luger Acta C 42(1986) p.873 L.