| http://www.w3.org/ns/prov#value | - The most preferred final compounds are the acids and alkali metal salts of formula I wherein R4 is 2-thienyl, 3-thienyl, phenyl, or 4-hydroxyphenyl; X is heterothio, particularly wherein X is ##STR24## and R2 is straight or branched chain alkenyl of 2 to 4 carbons.
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