The strain in a molecule caused by the repulsion of electron clouds due to the rotation of atoms around a single bond.
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1-benzyl-3-oxo-1-azoniabicyclo[2.2.2]octane
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
1-(2,5-bimethylphenyl)naphthalen-2-amine
