| http://www.w3.org/ns/prov#value | - Examples of these compounds include compounds having a HS- group or a S2- group such as hydrogen sulfide or its salt, or sulfides including sodium sulfide, ammonium sulfide and the like; compounds having a S2 O3 2- group such as thiosulfuric acid or its salt; compounds having a RSH or RS- group such as lower alkylthiol including thiol, ethanethiol and 1-propanethiol or their salts; compounds havin
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