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Journal of the Chinese Chemical Society , 47 (4В) 961-965 (2000) - M.A.Raslan
Heterocyclic Fused Rings with Bridge Head Nitrogen Atoms: Single-Step Synthesis of Azolo [1",2": 1',2'] Pyrido [5',6': 5,4] Pyrimido [1,6-a] Benzimidazole; Pyrido [1,2-a] Benzimidazole; Pyrido [4",5": 2',3'] Pyrido [6',5': 4,5] pyrimido-[1,6-a] Benzimidazole and Polysubstituted Pyridine Derivatives
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http://www.ceps.com.tw/ec/ecjnlarticleView.aspx?jnlcattype=1&jnlptype=4&jnltype=27&jnliid=3598&issueiid=62766&atliid=1070594