Also grouped into stereo- and structural types, for 10 points, name this relationship characterized by shared molecular formulas but different structural formulas.
When hydrocarbon chains show different amounts of branching, it is called the "chain" type of this relationship. A certain enzyme that knots DNA turns it into the "topological" type of this. One example of this relationship is seen when two molecules are mirror-images of each other; they are called enantiomers. Also grouped into stereo- and structural types, for 10 points, name this relationship characterized by shared molecular formulas but different structural formulas.
When hydrocarbon chains show different amounts of branching, it is called the "chain" type of this relationship.
{isomerism} [accept word forms {such} as {isomers}]