| http://www.w3.org/ns/prov#value | - A process as claimed in claim 2, in which the mercaptan ester has the structure HS(CH2)n --Z--(CH2)m --Z--(CH2)n SH where Z represents the carboxy group ##STR26## where the carbon atom is connected to a carbon atom of the chain --(CH2)n or of the chain --(CH2)m, where n is a whole number from 1 to 9 and m is a whole number from 1 to 18, and the sum (2n+m) is at least 4.
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