Noun
(organic chemistry) A cation derived from benzoquinone
(medicine) The drug benzyl-[3-[[4-[3-[benzyl(diethyl)azaniumyl]propylamino]-3,6-dioxocyclohexa-1,4-dien-1-yl]amino]propyl]-diethylazanium used as the dichloride or dibromide that causes neuromuscular paralysis.
Source: en.wiktionary.org