ACD/Spectrus Processor
A notation , , or was used to express the position of the oxygen atom in the previous edition of the IUPAC Nomenclature of Organic Chemistry (see Rule C-913.2).

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This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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