2,3-BUTYLENE OXIDE 2,3-Dimethyloxirane 2,3-Epoxybutane 2-Butene expoxide 2-Butene oxide 3266-23-7 Butane, 2,3-epoxy- CCRIS 6033 EINECS 221-877-8 Oxirane, 2,3-dimethyl- beta-Butylene oxide beta-Oxybutene