The invention provides a novel group of 4(Z)-([2,4,5-cis]-2,4-diphenyl-1,3-dioxan-5-yl)hexenoic acids of formula I, wherein X is F, Cl, Br, CF3, CN, CH3O or NO2 and one of Y and Z is hydrogen or fluoro and the other is hydrogen, and their pharmaceutically acceptable salts; together with their pharmaceutical compositions for use in treating a variety of disease conditions. Also provided are methods for the manufacture of novel compounds. Representative compounds are those in which X is 2-cyano or 2-chloro and Y and Z are both hydrogen.
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