Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The initial synthesis of UK-427,857 (Maraviroc) is described including the preparation of 4,4-difluorocyclohexanoic acid and amide coupling utilizing a polymer supported reagent. ... UK-427,857 (Maraviroc) is a potent antagonist of the CCR5 receptor and is currently progressing through phase III ...