2-({4-[(2-carboxyphenyl)amino]-2-carboxy-3,6-dioxocyclohexa-1,4-dienyl}amino)benzoic acid

N-(3,6-dioxo-cyclohexa-1,4-dienyl)-anthranilic acid

2-(4-oxo-3,1-benzoxazin-2-yl)-3,1-benzoxazin-4-one

6,8-dibromo-2-methyl-3,1-benzoxazin-4-one

2-(3,4,5-trimethoxyphenyl)-4H-benzo[d][1,3]oxazin-4-one