Combination of two antibiotics, quinupristin, a derivative of pristinamycin I (streptogramin group B) and dalfopristin, a derivative of pristinamycin II (group A streptogramin). ll sagit de medicaments de la classe dantibiotique des streptogramines . This drug class of antibiotics of streptogramin. La denomination commerciale en Amerique du nord est le synercid. The trade name in North America is the Synercid.