Keywords: Emepronium.svg Skeletal formula of emepronium Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape Own 2007-08-15 Fvasconcellos 01 49 16 August 2007 UTC Muscarinic antagonists Quaternary ammonium ions Diphenylmethanes |