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621.2 - When in the compounds described in the preceding Rule the organic radical contains also a substituent to be named as principal group, a composite prefix is formed for the halogenosulfur group by attaching the number and substitutive name(s) of the halogen atoms (see Rule C-102) in front of the syllable "thio ".Examples to Rule C-621.1
see Rules C-641.1 and C-641.7 and Table XII)
See Recommendations'93 R-2.1, Table 2Examples to Rule C-621.2
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