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,
, and S=C(SH)2 are named as derivatives of thiocarbonic, dithiocarbonic,
and trithiocarbonic acid, respectively. Prefixes O- and S- are used, where necessary, to denote attachment of a radical or metal to oxygen and sulfur, respectively.
See Recommendations'93 R-5.7.1.3Examples to Rule C-544.1
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