ISPE Glossary of Pharmaceutical and Biotechnology Terminology

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The conversion of a chemical with a given molecular formula to another compound with the same molecular formula but a different molecular structure, such as from a straight-chain to a branched-chain hydrocarbon or an alicyclic to an aromatic hydrocarbon. Examples include the isomerization of ethylene oxide to acetaldehyde (both C2H4O) and butane to isobutene (both C4H10).

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