... Common name2,4-D (BSI, E-ISO, (m) F-ISO, WSSA); 2,4-PA (JMAF)IUPAC name(2, ... is ³96% pure. Mol. wt.221.0 M.f.C8H6Cl2O3FormColourless powder, with a slight phenolic odour. M.p.140 ... (25 °C). Insoluble in petroleum oils. Mono-n-butylamine salt: In water 18 g/l (30 ºC). Stability:2 ... . Hard water leads to precipitation of the calcium and magnesium salts, but a sequestering agent is included in formulations ...