(3-(1,1-Dimethylethyl)-4,5-dihydro-5-isoxazolyl)methylphosphinic acid 125674-79-5 3-tert-Butyl-2-isoxazolin-5-yl(P-methyl)phosphinic acid Phosphinic acid, (3-(1,1-dimethylethyl)-4,5-dihydro-5-isoxazolyl)methyl-