Linezolid drug molecule. Ball-and-stick molecular model of linezolid, an oxazolidinone antibiotic. This drug, sold under the brand name Zyvox, is an antibiotic used for the treatment of serious infections caused by Gram-positive bacteria that are resistant to other antibiotics. Its chemical formula is C16H20N3O4F. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue), and fluorine (green).