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It should come off on the rot. evap. if the pressure on yours goes to close to 0 mbar. Turn the water bath up to ~70oC and add a *Ignore me, I am impatient* trap between your flask and the rot. evap. itself, under those conditions it should be pulled as far as the *Ignore me, I am impatient* trap at least before condensing. But make sure others don't mind you using the rot. evap. under those elevated conditions and wash it afterwards if for nothing else than to get rid of the smell.
This is automatic. Kind of an easter egg. One day I might dig into the details and remove it.
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