Ring Transformations of Heterocyclic Compounds. Part 23. The UV Irradiation Product of Photochromic 2,4,6-Triaryl-1-(spiro[2H-1-benzopyran-2,2′-indoline]-6-yl)pyridinium Salts — A Phenolate Betaine or a Pyridinium Substituted Merocyanine Dye?

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