2,2,3-Trimethyloxirane 2-Methyl-2,3-butane oxide 5-17-01-00089 (Beilstein Handbook Reference) 5076-19-7 BRN 0102417 Butane, 2,3-epoxy-2-methyl- EINECS 225-784-3 Isoamylene oxide Oxirane, trimethyl- (9CI) TRIMETHYLOXIRANE Trimethylethylene oxide Trimethyloxacyclopropane beta-Isoamylene oxide