rel-m-nitro-threo-Chloramphenicol is an analog of Chloramphenicol (C325030); a broad spectrum antibiotic obtained from cultures of the soil bacterium Streptomyces venezuelae. It has a broad spectrum of activity against gram-positive and gram-negative bacteria. Also antibacterial and antirickettsial. Molecular Formula: C11H12Cl2N2O5 Molecular Weight: 323.13