| http://www.w3.org/ns/prov#value | - A compound having the formula: S1 (J1 --A1 --J2 --A2)n S2 wherein n is an integer less than 25; wherein S1 is selected from the group consisting of alkyl and aralkyl and S2 is selected from the group consisting of hydroxyl, S-alkyl and S-aralkyl; J1 and J2 are linking groups independently selected from the group consisting of sulfide, sulfoxide, and sulfone whereby J1 and J2 may be different in ea
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