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Synthesis of a phosphorodithioate linkage by solid-phase synthesis. (a) detritylation; (b) tetrazole; (c) sulfurization, capping, then washing; (d) repeat steps a–c; (e) detritylate then deprotect with NH4OH. R = pyrrolidino, R' = β-thiobenzoylethyl. Adapted from [85].
