| http://www.w3.org/ns/prov#value | - The hetero atom is an oxygen, sulfur or nitrogen atom, which is contained or intervenes in the form of ???OH, ???OR, ???O???, ???S???, ???S(???)???, ???NH2, ???NHR, ???NR2, ???NH???, or ???NR??? wherein R is an alkyl group of 1 to 20 carbon atoms, and especially 1 to 16 carbon atoms.
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