| http://www.w3.org/ns/prov#value | - in which n and p, independently of one another, denote a number of moles and range from 0 to 30, with the proviso that n+p is less than or equal to 30; R.sup.3 is a hydrogen atom or a linear or branched C.sub.1 -C.sub.6 alkyl radical and R.sub.4
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