| http://www.w3.org/ns/prov#value | - wherein each of R.sup.10, R.sup.11, R.sup.12 and R.sup.13 may be the same or different and each is selected from the group consisting of C1-C6 alkyl; R.sup.b is the radical --C.sub.m H.sub.2m --; R.sup.c is a terminating radical which can be
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