Two or more cyclic systems (single rings or fused systems) which are directly joined to each other by double or single bonds are named ring assemblies when the number of such direct ring junctions is one less than the number of cyclic systems involved. Examples:
Source:
InChI=1/C12H10/c1-3-7-11(8-4-1)12-9-5-2-6-10-12/h1-10H
ZUOUZKKEUPVFJK-UHFFFAOYAV
InChI=1/C10H16/c1-2-6-9(5-1)10-7-3-4-8-10/h1-8H2
AFQHVWWURXWNGD-UHFFFAOYAA
InChI=1/C12H8/c1-2-6-10-9(5-1)11-7-3-4-8-12(10)11/h1-8H
IFVTZJHWGZSXFD-UHFFFAOYAR
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
doi:10.1351/goldbook.
