| http://www.w3.org/ns/prov#value | - R4 and R5 represent independently a hydrogen atom, an alkyl group, a carboxyl group or other organic group, and Ar is a chromophore which absorbs the predetermined wavelength radiation and represents one of substituted or non-substituted benzene ring, condensed ring or heterocyclic ring groups bonded directly or through a linkage group to the main chain carbon atom. wherein
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