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thanks for the link. I had already seen it and was using it to assign my chirality. I guess I should clarify my question. In sketcher, does one input the highest priority neighbor first, then the second, and finally the third? The sketcher GUI has three columns list: B/3, F/4, & 1/5. Do these columns have any significance? Vu On Mon, 19 Mar 2007 15:35:43 -0700, Dale Tronrud <[log in to unmask]> wrote: > Garib has documentation on his website that I presume matches what is >required by sketcher. It can be found at > >http://www.ysbl.york.ac.uk/~garib/refmac/docs/theory/chiral.html > > (I did a Google of "ccp4 chiral" to find it.) > >Dale Tronrud > >Vu Thai wrote: >> Hi All, >> >> I was wondering how to properly define the stereochemistry for a new ligand >> in sketcher. In the sketcher interface there are three columns after the >> stereochem sign option. I would assume that the order in which you enter >> the chiral neighbors would effect the sign that you choose for your >> stereochemistry. Does any one know how sketcher reads these three columns >> to determine the stereochemsitry? >> >> Thanks in advance for your help. >> Cheers, >> Vu