| http://www.w3.org/ns/prov#value | - Thus at least one of X1, X2, Y1, Y2 or Z may independently be a C1-C10 alkyl group such as methyl, trifluoromethyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, pentyl, cyclopentyl, hexyl, cyclohexyl, ethyl-hexyl, iso-octyl, n-nonyl, n-decyl or iso-decyl; an alkaryl group such as benzyl or ethylphenyl; an aryl group such as phenyl, tolyl or xylyl; or a C1-C10 alkoxy grou
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