Determination of the lipophilicity of some carbonyl derivatives of 2-aminoimidazolines-2 by reversed-phase thin-layer chromatography. Part 2. The lipophilicity of 1,6-diaryl- 5,7(1H)dioxo-2,3-dihydroimidazo[1,2-a][1,3,5]triazines and 1- aryl-5,6 (1H) dioxo-2,3-dihydroimidazo[1,2-a]imidazoles