| http://www.w3.org/ns/prov#value | - phosphorus atom, an oxygen atom and a sulfur atom; and each Xl may be the same or different and is a hydrogen atom, a halogen atom, a hydrocarbon group which has 20 or less carbon atoms and may contain 1 or more double bonds, a silyl group containing 20 or less silicon atoms, a germyl group containing 20 or less germanium atoms or a boronyl group containing 20 or less boron atoms; [0043] wherein M
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