Chlortetracycline-13C,d3 hydrochloride (7-Chlorotetracycline-13C,d3 hydrochloride) is the 13C- and deuterium labeled Chlortetracycline hydrochloride (HY-B1327). Chlortetracycline hydrochloride is an orally active, selective antibiotic, that inhibits methanogenic bacteria through inhibition of bacterial protein synthesis. Chlortetracycline hydrochloride is a specific and potent calcium ionophore antibiotic, that inhibits binding of aminoacyl-tRNA to ribosomes[1][2][3][4][5].