| http://www.w3.org/ns/prov#value | - X???(CH2???CH2???O)n???X wherein n is at least 1; X is a covalent bound or capable of reacting with an amino acid, or is an R or RO radical in which the oxygen is bound to the polyethylene oxide and R is selected from the group selected from the group of methylene, ethylene, propylene, o-, m- and p-phenylene, o-, m- and p-phenylene carbamate unsubstituted or subsituted by at least one alkyl, aryl,
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