1,4-Dihydro-2,3-quinoxalinedione 15804-19-0 2,3-Dihydroxyquinoxaline 2,3-Quinoxalinediol 2,3-Quinoxalinedione, 1,4-dihydro- NSC8698 Quinoxaline, 2,3-dihydroxy- Usaf ek-6232 WLN: T66 BN ENJ CQ DQ