Citation: An. Andin et al., Nitrogen-containing heterocycles on the basis of tetracarbonyl compounds and their analogs. 1. Synthesis of 2-(4,4-dimethyl-2,6-dioxocyclohexyl)-1,4-diphenylbutane-1,4-dione and its reactions with N-nucleophiles, KHIM GETERO, (11), 1999, pp. 1497-1499