| http://www.w3.org/ns/prov#value | - wherein R1 represents a hydrogen or a methyl group; R2 represents an organic chain containing at least one oxyalkylene 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 a number of between 1 and 5; z represents zero or a numerical value of between 1 and 10, provided that z is zero
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