1,4-Dihydro-1-phenyl-2H-3,1-benzoxazin-2-one 1-Phenyl-2H-3,1-benzoxazin-4-one 13213-90-6 2H-3,1-BENZOXAZIN-2-ONE, 1,4-DIHYDRO-1-PHENYL- BRN 0651603 VUFB-6775