Two molecules are enantiomers if they are mirror images of each other and yet cannot be superimposed (hence the term nonsuperimposable mirror images).

Is is important to notice that the term enantiomer is always used in reference to one of a pair of molecules. Two molecules can be enantiomers of each other. In this way it is similar to the term isomer, though enantiomer is a much more specific term.

Remember, a molecule will have an enantiomer (a nonsuperimposable mirror image) if it contains one or more chiral carbon atoms.