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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, p. 857, June, 1991.
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Luk'yanov, B.S., Nivorozhkin, A.L., Ivanov, N.B. et al. Synthesis of spirothiapyrans with a condensed quinoline fragment. Chem Heterocycl Compd 27, 680 (1991). https://doi.org/10.1007/BF00472535
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DOI: https://doi.org/10.1007/BF00472535