Enantiomers are a type of stereoisomer that are non-superimposable mirror images of each other. These molecules have the same molecular formula and connectivity of atoms but differ in their three-dimensional arrangement. Enantiomers typically occur in chiral molecules, which possess a carbon atom bonded to four different substituents, leading to two distinct spatial configurations.
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Key exmaple: d and L amino acids. Enantiomers have identical physico-chemical properties. But their biological roles can be very different, because an enzyme might only be able to act on one of them.