Antireflective compositions characterized by the presence of an SiO-containing polymer having chromophore moieties and transparent moieties are useful antireflective hardmask compositions in lithographic processes. The harvester can be configured to include or accommodate interchangeable header assemblies having different numbers of rows andor row spacings. In another embodiment, free iron ion levels are reduced in a subject by administration of a disulfide derivative of a dithiocarbamate to scavenge free iron ions, for example, in subjects undergoing anthracycline chemotherapy.