S 2367 (OTTO) Sodium selenite, pentahydrate, GR 99%+ Cas 26970-82-1 - used in the preparation of stock solutions of Se(IV). SS 2367 (OTTO) Sodium selenite, pentahydrate, GR 99%+ Cas 26970-82-1 - used in the biosynthesis of Se nanomaterials using Pseudomonas alcaliphila.