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Ev. Babaev et al., Heterocycles containing the bridge nitrogen atom. 11. Recyclization of 5-methyloxazolo[3,2-a] pyridinium cation under the action of nucleophiles containing NH2-group. Crystal structure of 3-(p-nitrophenyl)-1,4-dihydropyrido[2,1-c]-as-triazinium perchlorate, KHIM GETERO, (4), 1999, pp. 550-556