| http://www.w3.org/ns/prov#value | - The compound of claim 21, wherein the metal M is selected from the group consisting of copper, zinc, manganese and magnesium, x is an integer of 1 to 4, inclusive, L is a member selected from the group consisting of alkoxy, carboxylate, alcohol and amine, y is an integer of from 1 to 6 inclusive, R1 and R2 are selected from the group consisting of loweralkyl, and z is an integer of from 2 to 10, i
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