Colistinsulphate, min. 19.000 IU/mg, for biochemistry, Molar mass (M) 1066,32 g/mol, Storage temp. +4 °C, CAS No. [1264-72-8], UN-Nr. 2811, EG-Nr. 215-034-3, Empirical formula C45H85N13O10 · H2SO4