Mechanism of isomerization and acid-induced transformations of 3′-hydroxy-4,4′-dimethoxy- 3′-methyl-3-oxo-7,7′- bis(piperidino- carbonyloxy)-2,2′-spirobi- [2H,2'H,3H,3′H-benzo[b] thiophene]. unusual equilibrium between the Spiro and 3-hydroxy- benzothioph

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