ChemInform Abstract: Polycyclic N‐Heterocyclic Compounds. Part 72. Reaction of N‐([1]Benzofuro(or Benzothieno)[3, 2‐d]pyrimidin‐4‐yl)formamidine and N‐(Pyrido[2, 3‐d]pyrimidin‐4‐yl)formamidine Derivatives with Hydroxylamine Hydrochloride. Issue 4 (31st January 2013)