Explanatory notes
… - Chloramphenicol and its derivatives; salts thereof 2941.50 - Erythromycin and its derivatives; salts thereof … group because it is not antibiotically active. Subheading 2941.50 Erythromycin derivatives are active antibiotics … (INN). However, azithromycin (INN) which contains a 15-atom central ring and picromycin which contains no …