(2,3-dioxo-7-(1H-imidazol-1-yl)-6-nitro-1,2,3,4-tetrahydro-1-quinoxalinyl)acetic acid monohydrate 1(2H)-Quinoxalineacetic acid, 3,4-dihydro-7-(1H-imidazol-1-yl)-6-nitro-2,3-dihydro- 210245-80-0 7-(1H-Imidazol-1-yl)-6-nitro-2,3-dioxo-3,4-dihydro-1(2H)-quinoxalineacetic acid YM 872 YM872 Zonampanel