2014. On August 24, 2017, the U.S. state of Florida executed Mark James Asay using a combination of etomidate, rocuronium bromide, and potassium acetate. References Muscle relaxants Nicotinic antagonists Quaternary ammonium compounds 4-Morpholinyl compunds Schering-Plough brands Merck & Co. brands Pyrrolidines Acetate esters Chemical substances for emergency medicine Allyl compounds Neuromuscular blockers Lethal injection components