(3-(4-Pyridinyl)-2-isoxazolin-5-yl)phosphonic acid diammonium salt 125674-59-1 Diammonium (4,5-dihydro-3-(4-pyridinyl)-5-isoxazolyl)phosphonate Phosphonic acid, (4,5-dihydro-3-(4-pyridinyl)-5-isoxazolyl)-, diammonium salt