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L. Brooker and A. Fumia, French Patent No. 1,574,253 (1969); Chem. Abstr., 73, 26,632 (1970).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.5, pp. 711–712, May, 1974.
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Slominskii, Y.L., Radchenko, I.D. Condensation of dimethylidynehemicyanines with ketones. Chem Heterocycl Compd 10, 618–619 (1974). https://doi.org/10.1007/BF00471342
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DOI: https://doi.org/10.1007/BF00471342