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Either of a pair of molecules that are mirror images but cannot be superimposed on each other, and that rotate the plane of polarized light by an equal amount in opposite directions. Also called enantiomorph, optical isomer.

[Greek enantios, opposite; see ant- in Indo-European roots + -mer, isomer.]

en·an′ti·o·mer′ic (-mĕr′ĭk) adj.


(Chemistry) chem a molecule that exhibits stereoisomerism because of the presence of one or more chiral centres


(ɪˈnæn ti ə mər)

either of a pair of optical isomers that are mirror images of each other.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.enantiomer - either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical
chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
References in periodicals archive ?
US-based autoimmune disease therapies developer ImmunoMolecular Therapeutics (IM Therapeutics) has been issued US Patent 9,629,848 covering the use of methyldopa (MDOPA) and other small molecular entities in immunotherapy for type 1 diabetes and US Patent 9,820,957 covering the use of the D enantiomer of methyldopa (D-MDOPA) for T1D and celiac disease, the company said.
Levobupivacaine contains a single enantiomer of bupivacaine hydrochloride belonging to the family of n-alkyl substituted pipecoloxylidide.
Chemists long ago discovered that when a drug has effects in the very chiral environment that is the human body, it is often only one enantiomer of the drug that is doing the work, while the other is inert.
While a somewhat unusual case, the SCC confirmed that the selection of one enantiomer from a known racemate, with the disclosure that the selected enantiomer had better activity, constituted a valid selection.
The S- enantiomer produces anaesthesia of longer duration than the racemate-form1.
14, 15) We used (-)-Sp as the chiral ligand for the enantiomer-selective polymerization of racemic 1-phenylethyl methacrylate in 1977, and found that a very high enantiomer selection takes place when combined with Grignard reagents.
The difference can be so great that one of the enantiomers shows the desirable medical properties while another enantiomer is known as a highly toxic component for the biological environment.
The optical resolution of racemates has been essential in the perfume production pharmaceutical industry food preparation and so forth due to the harmful effect of one of the enantiomer of racemate mixture.
For example, carvone is a chiral terpenoid where the R enantiomer smells like spearmint while the S enantiomer has the distinct odor of caraway seed.
Gonzaolez, "Development of a new method for the enantiomer specific determination of HBCD using an ion trap mass spectrometer," Analytica Chimica Acta, vol.
The S(+) enantiomer is associated with prostaglandin inhibition and toxicity and the R(-) enantiomer is linked with analgesic action and protection of gastrointestinal tract.
For this purpose we have developed a special, highly efficient catalyst system which ensures that mainly just a certain enantiomer is synthesized from the citral.