| http://www.w3.org/ns/prov#value | - or R16 is a mono-, bi- or tricyclic heterocyclic ring system containing from 3 to 15 ring members including carbon and 1 to 4 hetero atoms selected from nitrogen, oxygen and sulfur atoms, wherein the carbon, nitrogen and sulfur atoms may be optionally oxidized and the nitrogen atoms may be optionally quarternized, and wherein the heterocyclic ring system may be partially or fully saturated or arom
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