Nomenclature of Assemblies of Identical Units
Rule C-74. Assemblies of Identical Acyclic Units 
74.1 - Some directly linked, identical, acyclic units are conveniently named as assemblies of units, although in general the use of rules
similar to C-71 and C-73 is precluded by the rules of Subsection C-0.13 governing the choice of the principal chain.
Examples to Rule C-74.1
However,
74.2 - The following acyclic nitrogen compounds, and their derivatives and substitution products, may be named as assemblies of identical units, with the numbering shown (see also
Rule C-72.1):
(However, for Biguanide, see Rule C-962.1)
See Recommendations'93 R-2.4.4 and R-1.2.8
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Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.
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