| abstract |
A method of testing the purity of a sample of Telithromycin or a pharmaceutical dosage form comprising Telithromycin, which method comprises assaying the said sample for the presence of compound A, B and D, wherein compound A is represented by following structural formula (I); Compound A compound B is represented by following structural formula (II); and compound B and compound D is represented by following structural formula (III) and the compounds A, B and D as well as their uses as reference markers for testing the purity of a sample of Telithromycin or a pharmaceutical dosage form comprising Telithromycin. |