A reversible antagonist of the muscular nicotinic acetylcholine receptor (mnAChR), assuming that the tri-peptide is binding to the epsilon subunit of the mnAChR which prevents binding of acetylcholine to the receptor, consequently mnAChR remains closed, in the closed state, there is no uptake of sodium ions (Na+) and the muscles stay relaxed.Wuhan Oner Biotech Co., Ltd. (www.onerbio.com)