ChemInform Abstract: 1-Benzyl-3,3,5′,6′-tetramethylspiro[indoline-2,2′-[2H]pyrano [3,2-b]pyridinium] Iodide (V), Its Hydrate, and a Neutral Precursor of the Salts: Synthesis, Crystal Structure, Photochromic Transformations in Solutions and in Crystals.

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