ChemInform Abstract: The Synthesis of Novel Polycyclic Heterocyclic Ring Systems via Photocyclization. Part 21. Naphtho[2′,1′:4,5]thieno[2,3-c]naphtho[1,2-f]quinoline, Naphtho[2′,1′:4,5]thieno[2,3-c]naphtho[1,2-f][1,2,4]triazolo [4,3-a]quinoline, and Naphtho[2′,1′:4,5]thieno[2,3-c]naphtho[1,2-f]tetrazolo[1,5-a]quinoline.

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