SYNTHESIS OF 2-AMINOCHROMENE DERIVATIVES FROM 1-(2-IMINO-2H-CHROMEN-3-YL)PYRIDIN-1-IUM PERCHLORATES AND NITROMETHANE IN BASIC MEDIUM Article Storozhenko O.А., Yue X., Festa A.А., Varlamov A.А., Voskressensky L.G. Chemistry of Heterocyclic Compounds. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 56. 2020. P. 1161-1166