| http://www.w3.org/ns/prov#value | - ?, ???NR???C(???O)O R???, ???SO2R???, ???SO2NR???R???, and ???NR???SO2R???, where R??? and R??? are individually hydrogen, lower alkyl (e.g., straight chain or branched alkyl including C1-C8, preferably C1-C5, such as methyl, ethyl, or isopropyl), cycloalkyl, heterocyclyl, aryl, or arylalkyl (such as benzyl), and r is an integer from 1 to 6.
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