| http://www.w3.org/ns/prov#value | - ???NRPRCH2???, ???NRPRCH2CH2???, ???S???, ???SRPR, ???S(O)???, ???S(O)(O)???, ???S(O)ORPR, ???S(O)H, ???CN, ???NO2, halogen, and combinations of these moieties where RPR independently is hydrogen, a protecting group or both RPR together are a protecting group.
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