Keywords: Avosentan.svg Skeletal formula of avosentan Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 12 0 and Inkscape Optimized with vim own 2012-10-27 Fvasconcellos Orphan drugs Phenol ethers Pyridines Pyrimidines Sulfonamides Endothelin receptor blockers |