| http://www.w3.org/ns/prov#value | - sub.2CH.s ub.2OH (3,11-dithia-6,8-dioxa-tridecadiol-1,13) ##STR10## 5-hydroxy-3-thia-pentanoic acid mono-ethylene glycol ester ##STR11## n = 1-8 bis-(thiodiglycol) esters of C.sub.3.sub.-10 dicarboxylic aliphatic acids ##STR12## bis-(thiodiglycol) ester of fumaric or maleic acid Preferred primarythiadiols are those having from 2 to 20 carbon atoms, especially thiadiols containing 3 to 10 carbon at
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