3-[3-[3-[2-ethyl-4-(4-fluorophenyl)-5-hydroxyphenoxy]propoxy]-9-oxoxanthen-4-yl]propanoic acid 3-[3-[3-[2-ethyl-4-(4-fluorophenyl)-5-hydroxy-phenoxy]propoxy]-9-oxo-xanthen-4-yl]propanoic acid 3-[3-[3-[2-ethyl-4-(4-fluorophenyl)-5-hydroxyphenoxy]propoxy]-9-oxo-4-xanthenyl]propanoic acid 3-[3-[3-[2-ethyl-4-(4-fluorophenyl)-5-hydroxy-phenoxy]propoxy]-9-keto-xanthen-4-yl]propionic acid