V. L. Gein, O. S. Panova, E. P. Tsyplyakova, L. I. Varkentin, M. I. Vakhrin and Z. L. Aliev, Synthesis of 6-butyl-7-methylidene-8-phenyl-5 H -pyrrolo-[3,4- d ]tetrazolo[1,5- a ]pyrimidin-5-one, Volume 43, Number 9, 1419-1420
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http://dx.doi.org/10.1134/S1070428007090308