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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1567–1568, November, 1989.
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Tolmacheva, V.S., Tolmachev, A.A., Shevchuk, L.I. et al. Direct sulfonation of 1,3,3-trimethyl-2-methyleneindoline. Chem Heterocycl Compd 25, 1315 (1989). https://doi.org/10.1007/BF00481536
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DOI: https://doi.org/10.1007/BF00481536