| http://www.w3.org/ns/prov#value | - ##STR00003## in Formula (I), R.sup.1 and R.sup.2 each are independently a hydrocarbyl group having 1 to 30 carbon atoms, preferably 1 to 20 carbon atoms, more preferably 2 to 18 carbon atoms, and especially preferably 3 to 18 carbon atoms.
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