1,7-Diazaindene 1,7-Dideazapurine 1H-PYRROLO(2,3-b)PYRIDINE 271-63-6 7-Aza-1-pyrindine 7-Azaindole 7H-Pyrrolo(2,3-b)pyridine EINECS 205-981-0 NSC 67063