Novel Pentaheterocycles. First General Synthesis Entry to Functionalized Derivatives of Pyrido[2,3-f:6,5-f?]di[1,2,4]triazolo[4,3-a] pyrimidin-5(1H)-ones
Novel Pentaheterocycles. First General Synthesis Entry to Functionalized Derivatives of Pyrido[2,3-f:6,5-f?]di[1,2,4]triazolo[4,3-a] pyrimidin-5(1H)-ones