56.1 - Radicals derived from hydrocarbon ring assemblies other that benzene ring assemblies by removal of one or more hydrogen atoms from only one ring are named with that ring as the parent radical, the remaining rings being named as substituents.
Note: This method is used for assemblies of non-identical systems; also it is sometimes preferable to that of Rule A-55 for assemblies of identical systems when a group to be specified as a suffix or as a separate word is present in a chain attached to the ring assembly.
Examples to Rule A-56.1
See Recommendations'93 R-2.4.4
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