Abstract The chemical properties of 8, 18-disubstituted 6, 16-diphenyl-1, 2, 3, 11, 12, 13- tetrahydrodibenzo [g, o]-4, 14-dioxa-1, 5, 11, 15-tetraazahexadecine-2, 12-diones have been studied, including their interaction with N-nucleophiles (hydroxylamine, hydrazine, semicarbazide, and thiosemicarbazide), acidic and alkaline hydrolysis, and methylation. A hypothesis has been made from analysis of the mass spectral data of the ...