.beta.,.beta.-Bis(trifluoromethyl)-.beta.-propiolacetone 1718-33-8 2-Oxetanone, 3,3-bis(trifluoromethyl)- 2-Oxetanone, 4,4-bis(trifluoromethyl)- 4,4-Bis(trifluoromethyl)-2-oxetanone NSC202601 WLN: T4OVTJ DXFFF DXFFF