ChemInform Abstract: 3‐Azidothieno[2, 3‐b]pyridine Thermolysis as a Route to Novel peri‐Anellated Heterocyclic Derivatives — Benzo(furo)thieno[2, 3, 4‐ij]‐2, 7‐naphthyridines. Issue 33 (August 2015)