Medvedeva, S. M., Plaksina, M. E., & Shikhaliev, K. S. (2015). The synthesis of 6-R-2,2,4-trimethyl-1,2-dihydroquinoline- and 6-R-4-R’-2,2,4-trimethyl-1,2,3,4-tetrahydroquinoline-8-carboxylic acids – the structural analogues of helquinoline. Journal of Organic and Pharmaceutical Chemistry, 13(3(51), 21–25. https://doi.org/10.24959/ophcj.15.847