| http://www.w3.org/ns/prov#value | - (e) when X is ???S??? by a process analogous to process (c) wherein (e1) a metal thioxide compound of the formula HET???SM where M is an alkali metal, or another metal, such as silver, known to promote S-alkylation; or (e2) alternatively by a process analogous to process (c) using HET???SH and a compound of formula (II) in which Yp is a suitable leaving group;
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