prov:value
| - For example, suitable spacer groups include a single bond and a linear C1 -C30 or branched C3 -C30 alkyl group each optionally interrupted, when there are at least two carbon atoms, by one or more aromatic groups, peptide groups, heterocyclic groups, NH, NR where R is a C1 -C18 hydrocarbon group, O, S, COO, oxygenated sulfur, i.e., SOn where n is 1-4, CO, phosphorous, oxygenated phosphorous such a
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