Synthesis of novel fluorine-containing tetracyclic ring systems: 2-Methyl-1-oxo-11H-1,2,4-triazino [3′,4′:3,4][1,2,4] triazino [5,6-b] indole and 3-methyl-4-oxo- 11H-1,2,4-triazino [4′,3′: 2,3][1,2,4] triazino [5,6-b] indole

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