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- [21] The synthesis of novel polycyclic heterocyclic ring systems via photocyclization.: 22.: Dibenzo[f,h]benzothieno[2,3-c]quinoline, dibenzo[f,h]benzothieno[2,3-c][1,2,4]triazolo[4,3-a]quinoline and dibenzo[f,h]naphtho[2′,1′:4,5]thieno[2,3-c]quinoline JOURNAL OF HETEROCYCLIC CHEMISTRY, 2000, 37 (04) : 997 - 1001