| http://www.w3.org/ns/prov#value | - wherein Me is MXn(O)p 2+, M is a cation derived from a metallic or semimetallic element, X is a halide or alkoxide, O is an oxygen atom, n is an integer from 0 to 3, and p is an integer from 0 to 1, each of A, D and E is independently H, OH, OR4, NR3 2, F, Cl, Br, I, NO2, CN, ???NCS and ???SCN; R2 is selected from the group consisting of H, SO3H, SO3 ???(1/n)Mn+, CO2H and CO2-(1/n)Mn+; and R10 is
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