| http://www.w3.org/ns/prov#value | - atoms. R.sub.3, R.sub.4, and R.sub.5 can independently have the structure C.sub.nH.sub.m, where n is an integer of about 2-20, and m is zero to about 40. Any one or more of the hydrogen atoms in R.sub.1 to R.sub.5 may be substituted with halogens,
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