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- [10] The synthesis of novel polycyclic heterocyclic ring systems via photocyclization .19. Thieno[3',2':4,5]thieno[2,3-c]-naphtho[1,2-f]quinoline, thieno[3',2':4,5]thieno[2,3-c]naphtho[1,2-f][1,2,4]triazolo[4,3-a]quinoline and thieno[3',2':4,5]-thieno[2,3-c]naphtho[1,2-f]tetrazolo[1,5-a]quinoline JOURNAL OF HETEROCYCLIC CHEMISTRY, 1997, 34 (05) : 1597 - 1601