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Isomer

One of two or more chemical compounds with the same molecular formula.

Molecules sharing chemical composition but differing in atomic arrangement (structural isomers) or spatial configuration (stereoisomers).

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Molecules sharing chemical composition but differing in atomic arrangement (structural isomers) or spatial configuration (stereoisomers).

Isomerases, Stereoisomers