1,3-BUTYLENE OXIDE 1-Methyltrimethylene oxide 2-Methyloxetan 2-Methyloxetane 2167-39-7 5-17-01-00054 (Beilstein Handbook Reference) BRN 0102394 Butane, 1,3-epoxy- HSDB 1656 Oxetane, 2-methyl- Oxetane, 2-methyl- (9CI)