It functions as a certified impurity for HPLCLC-MS analysis in rifampicin quality control stability testing and pharmacopeial compliance during anti-TB drug manufacturing.

Its primary purpose is quantifying demethylation impurities from metabolic or synthetic pathways ensuring rifampicin purity meets regulatory limits (0.5% individual degradants)

27-Demethyl Rifampicin Impurity (CHNO) is a rifampicin degradation product lacking the 27-methyl group on the piperazine ring of the parent antibiotic supplied as a solid reference standard with molecular weight 808.9 gmol.