27729-98-2 4-Fluorochalcone oxide BRN 5338714 CCRIS 2226 Methanone, (3-(4-fluorophenyl)oxiranyl)phenyl-, trans- Propiophenone, 2,3-epoxy-3-(p-fluorophenyl)-, trans- trans-(3-(4-Fluorophenyl)oxiranyl)phenylmethanone