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R Guryn, A Kotelko and M Majchrzak / Synthesis of hexahydrodiazepine-1,4 derivatives with potential pharmacological action. II. Synthesis of alkyl derivatives of hexahydrodiazepine-1,4 from 4-alkylhomopiperazin-2-ones // Acta Pol Pharm 32(4):421-427 (1975)
