143000-05-9 2,3-Dihydro-2-phenyl-4H-1,3,2-benzoxazophosphorin-4-one 2-Phenyl-2,3-dihydro-1,3,2(lambda(5))-benzoxazaphosphoryl-4-one 4H-1,3,2-Benzoxazophosphorin-4-one, 2,3-dihydro-2-phenyl- PDBPO