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In these recommendations, hydro and dehydro prefixes are presented as nondetachable. For indexing purposes, Chemical Abstracts Service and Beilstein treat hydro prefixes as detachable; the former alphabetizes them with substitutive prefixes and the latter treats them as a separate kind of prefix cited after the substitutive prefixes. The whole question of order of precedence of hydro prefixes is under consideration by the Commission.

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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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