5,7-difluoro-1,2,3,4-tetrahydronaphthalene derivatives and their
5-alkyl-2-(3,4-difluorophenyl)pyrimidine and nematic liquid crys
5-oxy-2-phenylpyridines, and a liquid-crystalline medium
5-Substituted-2-(4-cyanophenyl)-1,3-dioxanes
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