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Ev. Babaev et al., Heterocycles containing the bridge nitrogen atom. 13. Atypical example of sulfurizing action of dimethyl sulfate on attempt of methylation of 5-aminoindolizine. Crystal structure of 5-morpholyl-2-(p-nitrophenyl)indolizine-1-sulfonic acid methyl ester, KHIM GETERO, (9), 2000, pp. 1245-1250