| http://www.w3.org/ns/prov#value | - A compound of the formula: ##STR104## wherein R1 and R4 are each an alkyl or aryl group which can be substituted, R5 is selected from hydrogen or an alkyl group which can be substituted, A and A1 each represent a divalent organic linkage, n is an integer of at least 2, Z is a core radical of valency n+1, and Y is a core radical of valency m which is at least 2.
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