V. L. Gein, V. V. Mishunin, E. P. Tsyplyakova, O. V. Vinokurova and M. I. Vakhrin, Synthesis and antimicrobial activity of methyl-7-aryl(heteryl)-6-(2-thienoyl)-4,7- dihydrotetrazolo[1,5-a]pyrimidine-5-carboxylates, Volume 43, Number 12, 652-654
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http://dx.doi.org/10.1007/s11094-010-0373-1