| http://www.w3.org/ns/prov#value | - radical,Y represents a halogen atom, a hydrogen atom, a hydrocarbon radical, a silyl radical, a halogenated hydrocarbon radical, a nitrogen-containing organic radical, an oxygen-containing organic radical or a sulphur-containing organic radical, e and f each isan integer of 0 to 5, m and n each is an integer of 0 to 3, proviso m+n is an integer of 1 to 3,wherein M represents titanium, zirconium or
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