DescriptionDecision tree for IUPAC polymer nomenclature.png
English: The order of subunit seniority. The senior subunit is at the top centre. Subunits of lower seniority are found by following the arrows. The type of subunit, be it a heterocycle, a heteroatom chain, a carbocycle, or a carbon chain, determines the colour of the arrow to follow.
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From IUPAC Subcommittee on Polymer Terminology, modified to fit wiki page and incorporate other additional details, i.e., from the reference IUPAC. Pure Appl. Chem. 74, 1921—1956 (2002).
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I inserted additional information to the image concerning the rules for the naming of heteroatom rings and heteroatom chains while again dealing with prior copyright concerns by creating this new image.