| http://www.w3.org/ns/prov#value | - ylene group and said organic chain may be linear, branched or cyclic and may contain one or more atoms other than carbon, hydrogen or oxygen; x and y each represents zero or an integer of between 1 and 5; z represents zero or an integer of between 1 and 10, provided that z is zero when both x and y are zero; wherein subunit {O(CH2)x (CH(CH3))y}z of said formula (IA) may comprise substituents (CH2)
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