THE EMPIRICAL FORMULA OF TYLOSIN PHOSPHATE IS;C46H77O17.H3PO4 CARRY OUT THE METHOD FOR HPLC. THE CONTENT OF;TYLOSIN A IN THE SUBSTANCE BEING EXAMINED IS NOT LESS THAN 80%.;CARRY OUT THE BIOLOGICAL ASSAY OF ANTIBIOTICS, THE UPPER FIDUCIAL;LIMIT OF ERROR IS NOT LESS THAN 800 UNITS PER MG, CALCULATED WITH;REFERENCE TO THE DRIED SUBSTANCE.