Seniority of Chains Rule C-13.2 13.21 - For choice of the principal chain, an acid is normally named by method (a) of Rule C-11.11 (-oic name) or an
existing trivial name is used, unless use of the ending carboxylic acid (method (b) of Rule C-11.11) leads to citation of a larger number of carboxyl groups as ending of the name.
Examples to Rule C-13.21
Seniority of Chains Rule C-13.3
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