Sofosbuvir. Molecular model of the drug Sofosbuvir (22.H29.F.N3.O9.P). This drug, sold under the brand name Sovaldi, is a nucleotide analogue used in combination with other drugs for the treatment of hepatitis C virus (HCV) infection. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (dark blue), oxygen (red), sulfur (yellow) and fluorine (light blue).