Which macrolide antibiotic is not commonly listed with the "-thromycin" suffix?

Vancomycin is the correct answer because it is not classified as a macrolide antibiotic and does not share the characteristic "-thromycin" suffix common to macrolides such as azithromycin, erythromycin, and clarithromycin. Instead, vancomycin belongs to a distinct class of antibiotics known as glycopeptides. It is primarily used for the treatment of serious infections caused by Gram-positive bacteria, particularly those resistant to other antibiotics.

Macrolides, on the other hand, are a group of antibiotics that inhibit bacterial protein synthesis and are characterized by their chemical structure, specifically the presence of a large lactone ring. This family includes azithromycin, erythromycin, and clarithromycin, each of which is utilized to treat a variety of infections, from respiratory tract infections to skin infections. The "-thromycin" suffix is indicative of their classification and structural similarity.

Thus, the different chemical classification and naming convention of vancomycin is what distinctly separates it from the macrolide antibiotics.