| http://www.w3.org/ns/prov#value | - Chemical modification includes without limitation the introduction of one or more, preferably two, three or four novel side chains or residues or the exchange of one or more functional groups like, for example, introduction or exchange of H; linear or branched alkyl, in particular lower alkyl (C1, C2, C3, C4, and C5, e.g. methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl
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