a type of organic reaction in which a ring system undergoes rearrangement through a concerted process involving the breaking and formation of sigma bonds
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(4R)-4-benzyl-3-[3-(4-methoxyphenyl)propanoyl]-1,3-oxazolidin-2-one
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
