Synonyms: Butane,1,2-epoxy- (8CI);Oxirane, ethyl- (9CI);1,2-Butene oxide;1,2-Butyleneepoxide;1,2-Butylene oxide;1,2-Epoxybutane;1-Butene oxide;1-Butylene oxide;2-Ethyloxirane;Butene 1,2-epoxide;DL-1,2-Epoxybutane;Ethylethylene oxide;Ethyloxirane;NSC 24240;a-Butylene oxide;