N. N. Thanh and N. M. Thao, Synthesis of some 2-aryl-4-(7’-hydroxy-4’-methyl-coumarin-6’(or-8’)-yl)-2,3-dihydro-1H-1,5-benzodiazepines., VJChem 48 (2012). DOI: https://doi.org/10.15625/2196.