2423-66-7 BAY-Va 9391 Bayo N-Ox Celbar Grofas ICI 8173 NSC21653 Quindoxin Quinoxaline 1,4-di-N-oxide Quinoxaline 1,4-dioxide Quinoxaline di-N-oxide Quinoxaline dioxide Quinoxaline, 1,4-dioxide Usaf h-1 WLN: T66 BN ENJ BO EO