| http://www.w3.org/ns/prov#value | - about 2 to about 10; R.sub.6 comprises a member selected from --OH, --SH, and --OOR, wherein R comprises a member selected from C.sub.n H.sub.2n+1 where n is an integer of from about 2 to about 10; and H; R.sub.7 comprises a member selected from
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