ChEBI: Pancuronium is a steroid ester in which a 5alpha-androstane skeleton is C-3alpha- and C-17beta-disubstituted with acetoxy groups and 2beta- and 16beta-disubstituted with 1-methylpiperidinium-1-yl groups. It is a non-depolarizing curare-mimetic muscle relaxant. It has a role as a muscle relaxant, a cholinergic antagonist and a nicotinic antagonist. It is a steroid ester and an acetate ester.