4-[(2,3-Dihydro-3-oxo-4H-1,4-benzoxazin-4-yl)methyl]benzoic acid

4-(4-Carboxybenzyl)-3,4-dihydro-3-oxo-2H-1,4-benzoxazine, 4-[(2,3-Dihydro-3-oxobenzo[b][1,4]oxazin-4-yl)methyl]benzoic acid