3-Isoxazolidinone, 4-((1-methyl-3-oxo-1-butenyl)amino)-, monosodium salt, hemihydrate (2:1), (R)- 59831-62-8 Pentizidone sodium Pentizidone sodium [USAN] sodium (R)-4-((1-methyl-3-oxo-1-butenyl)amino)-3-isoxazolidinone hemihydrate