1758-33-4 5-17-01-00061 (Beilstein Handbook Reference) BRN 0079770 Butane, 2,3-epoxy-, cis- CCRIS 3758 Oxirane, 2,3-dimethyl-, cis- (9CI) cis-2,3-Dimethyloxirane cis-2,3-Epoxybutane cis-2-Butene epoxide cis-2-Butene oxide cis-2-Butylene oxide