| http://www.w3.org/ns/prov#value | - The invention comprises a composition comprising at least one compound defined by the formula ##STR1## wherein R is hydrogen, C1-4 alkyl or a group ##STR2## wherein G is a divalent hydrocarbyl-linking group and J, D, E and F are hereinafter defined; wherein J and E independently are divalent linking groups selected from ##STR3## wherein R' is hydrogen or C1-4 alkyl; D is a divalent hydrocarbyl gro
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