| http://www.w3.org/ns/prov#value | - Rn and Ro are independently hydrogen, (C1???C6)alkyl, phenyl, benzyl, or (C1???C6)alkyl, phenyl, benzyl, or (C1???C6) alkanoyl; or Rn and Ro together with the nitrogen to which they are attached are a 3, 4, 5, or 6 membered heterocyclic ring;
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