Amdinocillin Pivoxil. FL-1039 . Mecillinam Pivaloyl Ester . Pivamdinocillin . Pivmecillinam Hydrochloride . Selexid . FL 1039 . FL1039 . Hydrochloride, Pivmecillinam . Pivaloyl Ester, Mecillinam . Pivoxil, Amdinocillin . Pivmecillinam . Pivaloyloxymethyl ester of amdinocillin that is well absorbed orally, but broken down to amdinocillin in the intestinal mucosa. It is active against gram-negative organisms and used as for amdinocillin. . 0.54