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Guy, Alain, Guetté, Jean-Paul, Lang, Gérard:
Utilization of Polyphosphoric Acid in the Presence of a Co-solvent
Synthesis (1980) Volume 1980 issue 03
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https://www.thieme-connect.com/ejournals/pdf/synthesis/doi/10.1055/s-1980-28974.pdfSynthesis of some new biologically active 1,3,4-oxadiazolyl nitroindoles and a modified Fischer indole synthesis of ethyl nitro indole-2-carboxylates.
Bioorganic & Medicinal Chemistry 2005 Aug 1; Vol. 13 (15), pp. 4638-44.
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http://dx.doi.org/10.1016/j.bmc.2005.04.068