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organic compounds
The trichromophoric system of the title compound, C39H39N2+.C6H2N3O7−, adopts a di-cis conformation in which the indolenine end groups are mutually rotated; the interplanar angle is 47.1 (1)°. The trans-configurate styryl moieties are anti orientated relative to the cyanine unit. The length of the extended chromophore (H19H19′) is 26.0 Å.