551.2 - When heterocyclic nomenclature according to the principles of Rule B-1 is applied to compounds containing sulfonium sulfur, "-ium" is added to the name of the ring system with elision of terminal "e" if present; when the principles of Rule B-6 are applied, replacement of CH by sulfonium sulfur is denoted by the prefix "thionia-". The name of the anion is finally added.
Example to Rule C-551.1
See Recommendations'93 R-5.8.2
Examples to Rule C-551.2
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