This can be any thioester of your choice, typically an alkyl or aryl thioester. Common examples include methyl thioesters.
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C14H18O2S
Propanethioic acid, 3-[[2-hydroxy-3,3-dimethyl-1-oxo-4-(phosphonooxy)butyl]amino]-, S-phenyl ester, (R)-
1-[(4S,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-ethanone
S-ethyl 2-(bromomethyl)-4-mesityl-2-methylbutanethioate
Cyclohexanecarbothioic acid, O-methyl ester
5-bromo-2-phenylbenzofuran-3-yl benzoate
C12H15NO5Se
(S)-S-2-oxobutyl 2-(benzyloxycarbonylamino)-3-phenylpropanethioate