1-Chloro-4-acetoxy-9,9,9-trifluorononane 、 、 ethyl 7-[N-(4-acetoxy-9,9,9-trifluorononyl)methanesulfonamido]heptanoate 以The subsequent step yields 7-[N-(4-hydroxy-9,9,9-trifluorononyl)methanesulfonamido]heptanoic acid (B)的产率得到7-[N-(4(R)-hydroxy-2-nonynyl)methanesulfonamido]heptanoic acid