Atropisomer

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Science and technology

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What Wikipedia says

Atropisomers are a kind of stereoisomer arising because of hindered rotation about a single bond, where energy differences due to steric strain or other contributors create a barrier to rotation that is high enough to allow for isolation of individual rotamers.

Excerpt from the Wikipedia article “Atropisomer”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Roland Mattern, Public domain, via Wikimedia Commons.