@H02889@ having two or more rings connected in the manner of links of a chain, without a @C01384@. More generally, the class catena compounds embraces functional derivatives and hetero analogues, e.g:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1327 [Terms] [Paper]