4'-Fluorochalcone oxide 73936-27-3 CCRIS 2227 Methanone, (4-fluorophenyl)(3-phenyloxiranyl)-, trans- Propiophenone, 2,3-epoxy-4'-fluoro-3-phenyl-, trans- trans-2,3-Epoxy-4'-fluoro-3-phenylpropiophenone trans-4'-Fluorochalcone oxide