Present participle of 'epimerize' (British spelling); the process of converting one epimer into another.
From 'epimerise' + '-ing' (present participle), from Greek 'epimer' + '-ise' (British).
When you're watching the process of 'epimerising' happen in real time in a lab, it's like witnessing molecular rotation—atoms spinning around their bonds until they reach a new configuration.
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