Acid Red 405 Chemical Name Acid Red 405 C.I. No. – CAS No. 83833-37-8 Synonyms Acid Red S-B, Neutral Complex red SB, Lanacron Bordeaux S-B, Ostalan Bordeaux SB, Ostalan Bordeaux S-B Molecular Formula C36H24CrN9Na2O9S2+ Molecular Weight 856.67