V. A. Anisimova, I. E. Tolpygin, O. I. Askalepova
Studies of Imidazo[1,2-a]Benzimidazoles 32*. Synthesis and Properties of 2,3-Dihydroimidazo-and 2,3,4,10-Tetrahydropyrimido[1,2-a]Benzimidazol-9(10)-Ylacetic Acids, Chemistry of Heterocyclic Compounds, 2014, Volume 49, Issue 12 , pp 1748-1756
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http://dx.doi.org/10.1007/s10593-014-1427-1Заранее спасибо!!!