Syntheses based on dimethylpyrazoles. 9. Synthesis and spectral peculiarities of isomeric pyrazolo[3?,4?-5,6]- and-[5?,4?-5,6]-pyrimido[1,2-b]benzo[d,e]isoquinoline-4,12-diones
Syntheses based on dimethylpyrazoles. 9. Synthesis and spectral peculiarities of isomeric pyrazolo[3?,4?-5,6]- and-[5?,4?-5,6]-pyrimido[1,2-b]benzo[d,e]isoquinoline-4,12-diones