ladder chain
A @D01849@, consisting of an uninterrupted @ST06775@ of rings, with adjacent rings having two or more atoms in common. Alternatively, a ladder chain is a double-strand chain with adjacent @C01288@ joined to each other through four atoms, two on one side and two on the other side of each @C01288@.
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2295 [Terms] [Paper]