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Trisulfide 
Summary
In organic and organometallic chemistry, trisulfide is the functional group R-S-S-S-R.
Examples include:
- Diallyl trisulfide
- Dimethyl trisulfide
- Trisulfane (hydrogen trisulfide)
Some inorganic compounds are also named trisulfides to reflect their stoichiometry.
Examples include: