Topoisomers or topological isomers are molecules with the same chemical formula but different topologies. Examples of molecules for which there exist topoisomers include DNA, which can form knots, and catenanes. DNA topoisomers can be interchanged by enzymes called topoisomerases .

References

• New Molecular Topologies Beyond Catenanes and Rotaxanes Essay 2000 Theresa Chang American Chemical Society Online Article

stereochemistry