has role propane-1,2-diols antineoplastic agent carbonyl compound organoiodine compound difluorobenzene secondary amino compound hydroxamic acid ester monofluorobenzenes PD 0325901 A hydroxamic acid ester that is benzhydroxamic acid (<em>N</em>-hydroxybenzamide) in which the hydroxamic acid group has been converted to the corresponding 2,3-dihydroxypropyl ester and in which the benzene ring has been substituted at position 2 by a (2-fluoro-4-iodophenyl)amino group and at positions 3 and 4 by fluorines (the <i>R</i> enantiomer). CHEBI:88249 EC 2.7.12.2 (mitogen-activated protein kinase kinase) inhibitor