| http://www.w3.org/ns/prov#value | - 0, 1 or 2; x is an integer from 0 to 8; y is an integer from 1 to 4; z is an integer from 1 to 5; R.sub.3 is an alkyl radical having 1 to 3 C atoms, which may be substituted by one or more hydroxyl groups; and in which A is a radical selected from
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