| http://www.w3.org/ns/prov#value | - As one example, in a chromophore defined as including D and one or more p-bridges, D may be selected from: [0196] and ?? may be selected from: [0197] For instance, the present invention provides a chromophore that has the structure [0198] wherein, independently at each occurrence, R is alkyl, aryl or heteroalkyl; R1 is alkyl, aryl or heteroalkyl; and X is O or S. For example, R may be ???(CH2)wOH,
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