ACD/Name
The numbering has to begin with a sulfur atom. The choice of which sulfur atom will begin the numbering is determined by the lower set of locants of the remaining heteroatoms without regard to kind. As the set 1,2,5 is lower than 1,3,4 or 1,3,6 or 1,5,4 in the usual sense, the name 1,5,2-dithiazine is preferred.


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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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