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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