E. S. Nikitskaya, E. I. Levkoeva, G. S. Arutyunyan, M. D. Mashkovskii and L. N. Yakhontov; Synthesis and pharmacological study of Promedol analogs with alkylaminoalkyl substituents in position; Pharmaceutical Chemistry Journal; English; 8; 10; 1974; 597 - 601
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http://dx.doi.org/10.1007/BF00761184