Rule C-53 53.1 - Benzene derivatives may be named by conjunctive nomenclature only when two or more identical side chains are present.
53.2 - Trivial names for oxo carboxylic acids (see Rule C-416.3) may be used for the acyclic component.
Example to Rule C-53.1
See Recommendations'93 R-1.2.4
Examples to Rule C-53.2
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