https://doi.org/10.1351/goldbook.L03441
A @D01851@ consisting of an uninterrupted @ST06775@ of rings, with adjacent rings having two or more atoms in common. Alternatively, a ladder macromolecule is a @D01851@ with @C01288@ joined to each other through four atoms, two on one side and two on the other side of each @C01288@.