Potassium Cation → 4-ethoxycarbonylmethyl-7-nitro-2H-1,4-benzoxazin-3(4H)-one

Reaction equation

[Br:1][CH2:2][C:3](=[O:4])[O:5][CH2:6][CH3:7].[C:22](=[O:23])([O-:24])[O-:25].[CH3:28][C:29]#[N:30].[K+:26].[K+:27].[N+:8](=[O:9])([O-:10])[c:11]1[cH:12][c:13]2[c:14]([cH:20][cH:21]1)[NH:15][C:16](=[O:19])[CH2:17][O:18]2>>[CH2:2]([C:3](=[O:4])[O:5][CH2:6][CH3:7])[N:15]1[c:14]2[c:13]([cH:12][c:11]([N+:8](=[O:9])[O-:10])[cH:21][cH:20]2)[O:18][CH2:17][C:16]1=[O:19]