? 1,5-Naphthyridine , with CAS number of 254-79-5, can be called 1,5-Naphthyridine ; 1,5-Diazanaphthalene ; Pyrido[1,5-B]pyridine ; 1,5-Pyridopyridine ; 1,5-Naphthyridine(6ci,8ci,9ci) ; Pyrido[3,2-B]pyridine .