CAS: 299409-85-1

Clarithromycin EP impurity B is a natural impurity in clarithromycin. Clarithromycin EP impurity B is synthesized by the metabolism of clarithromycin, and its chromatographic retention time is 13.5 minutes. It has been shown to have anti-inflammatory and immuno-suppressive effects, which may be due to its inhibition of prostaglandin synthesis. Clarithromycin EP impurity B has been shown to inhibit the growth of bacteria that are resistant to penicillin, ampicillin, and erythromycin.