| http://www.w3.org/ns/prov#value | - Illustrative derivatives of 2,5-dimercapto-1,3,4-thiadiazole include: ##STR1## wherein X is a substituent selected from hydrogen, --CRR'OH, --(CH2 --CH--O)n H, ##STR2## where m is an integer of from 2 to 10; n is an integer from 1 to 5; R and R' are selected from hydrogen, alkyl groups containing 1-8 carbon atoms, and aryl, alkaryl or aralkyl groups containing 6 to 8 carbon atoms; R2 is an alkyl g
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