2,3-Dimethyl-2,3-epoxybutane 2,3-Dimethyl-2-butene oxide 2,3-Epoxy-2,3-dimethylbutane 5076-20-0 Butane, 2,3-epoxy-2,3-dimethyl- NSC171212 Oxirane, tetramethyl- Tetramethylethylene oxide Tetramethyloxirane