| http://www.w3.org/ns/prov#value | - in which: (B) is --CH.sub.2 CH.sub.2 OX', wherein X' is an entity chosen from a --CH.sub.2 CH.sub.2 --COOH group and a hydrogen atom, (C) is --(CH.sub.2).sub.z --Y', wherein z=1 or 2, and wherein Y' is an entity chosen from --COOH and --CH.sub.2
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