hydroxamic acid phosphonic acids fosmidomycin Propylphosphonic acid in which one of the hydrogens at position 3 is substituted by a formyl(hydroxy)amino group. An antibiotic obtained from <em>Streptomyces lavendulae</em>, it specifically inhibits DXP reductoisomerase (EC 1.1.1.267), a key enzyme in the non-mevalonate pathway of isoprenoid biosynthesis. CHEBI:42526