Reactions of N-(ω-Chloroalkanoyl)-carbonimidic Dichlorides: A New Synthesis of 2-Oxo-1,2,3,4-tetrahydropyrimidobenzimidazoles, 2-Oxo-2,3-dihydro-1H-imidazobenzimidazoles, and 2-Oxo-2,3,5,10-tetrahydro-1H-imidazobenzodiazepines

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