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Hello David--

> 
> Is there a way of implementing the systematic swapping of prochirals
> (methylenes, methyls) during simulated annealing in Xplor-NIH? Some
> structure calculation programmes such as ARIA-CNS have this
> capability, but I wasn't sure about Xplor-NIH. I've been using sum
> averaging up to now, but I was just curious if the swapping approach
> could be used.
> 

To my knowledge this is not implemented within Xplor-NIH, however it
would not be difficult to code. I understand that it certainly can be
useful to e.g. stereoassign peaks.  

best regards--
Charles
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