Chloramphenicol, A bacteriostatic antibiotic and a selection agent, Synonyms: D-(G)-threo-2,2-Dichloro-N-[B-hydroxy-A-(hydroxymethyl)-B-(4-nitrophenyl)ethyl]acetamide, D-(G)-threo-2-Dichloroacetamido-1-(4-nitrophenyl)-1,3-propanediol, D-threo-2, CAS: 56-75-7, 25g