4-[(2β,3α,5α,16β,17β)-3,17-Di(acetyloxy)-2-(4,4-dimethylpiperazinium-1-yl)androstan-16-yl]-1,2,3,4-tetrahydro-1,1-dimethyl-pyrazinium Dibromide is an impurity of Pipecuronium bromide (P479780) which has been found using high-performance liquid chromatography (HPLC). Pipecuronium Bromide is a muscle relaxant and an anaesthesia used in patients undergoing coronary artery bypass graft surgery.