(3-(2-Pyridinyl)-2-isoxazolin-5-yl)phosphonic acid hydrobromide (4,5-Dihydro-3-(2-pyridinyl)-5-isoxazolyl)phosphonic acid monohydrobromide 125674-58-0 Phosphonic acid, (4,5-dihydro-3-(2-pyridinyl)-5-isoxazolyl)-, monohydrobromide