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The numbering must begin with the sulfur atom. This condition eliminates 2,1,4-thiadiazine and the set of locants 1,2,5 is preferred to 1,3,6.

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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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