S 1188 (OTTO) Samarium(III) nitrate, hexahydrate, 99.9% Cas no 13759-83-6 - used in NMR spectroscopy for spectra resolution and is used for doping purpose. S 1188 (OTTO) Samarium(III) nitrate, hexahydrate, 99.9% Cas no 13759-83-6 used as a chemical reagent.