109-99-9 Butane .alpha.,.delta.-oxide Butane, 1,4-epoxy- Butylene oxide Cyclotetramethylene oxide Diethylene oxide Furan, tetrahydro- Furanidine Hydrofuran NSC57858 Oxacyclopentane Oxolane THF Tetrahydrofuraan Tetrahydrofuran Tetrahydrofuranne Tetraidrofurano Tetramethylene oxide WLN: T5OTJ