A dimer is a chemical or biological entity consisting of two structurally similar subunits  calledmonomers, which are held together by either intramolecular forces (covalent bonds) or weakerintermolecular forces.
n chemistry, epimers are diastereomers that differ in configuration of only one stereogenic center. Diastereomers are a class of stereoisomers that are non-superposable, non-mirror images of one another, unlike enantiomers which are non-superposable mirror images of one another.
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