| http://www.w3.org/ns/prov#value | - e; a sulfhydryl group (--SH) and an alkyl halide group (--alkyl--X) or an alkyl sulfonate group (--S(???O)2 O--alkyl) which yield a thioether linkage (--S--); and a sulfhydryl group (--SH) and another sulfhydryl group (--SH) which yield a disulfide linkage (--SS--); wherein X (halide) is as defined above, Y is a pharmacologically acceptable group such as hydrogen or methyl and Z is a group such as
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