1-((3,4-Dihydro-3-oxo-2H-1,4-benzoxazin-2-yl)carbonyl)piperidine 24132-23-8 N-Pentamethylenecarbamoyl-2 oxo-3 dihydro-2,3 benzoxazine-1,4 [French] Piperidine, 1-((3,4-dihydro-3-oxo-2H-1,4-benzoxazin-2-yl)carbonyl)-