Mechanism of Isomerization and Acid-Induced Transformations of 3′-Hydroxy-4,4′-dimethoxy-3′-methyl-3-oxo-7,7′-bis(piperidinocarbonyloxy)-2,2′-spirobi[2 H ,2′ H ,3 H ,3′ H -benzo[ b ]thiophene]. Unusual Equilibrium between the Spiro and 3-Hydroxybenzothiophene Systems

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