Dilute hydrochloric acid converts the title compound (1) into (2), then into (4), and finally into (5) and (6): this fact requires revision to (2) and (14) of the structures (13) and (15) suggested by others.
V. Dave and E. W. Warnhoff, J. Chem. Soc. D, 1970, 919 DOI: 10.1039/C29700000919
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