PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8068031-5 1994 The other four coumarins (all containing ortho-dihydroxy catechol functions, and found previously to be pro-oxidant in cell-free systems by virtue of reduction of ferric to ferrous ions), themselves rapidly reduced cytochrome c. Coumarins 15-24 cytochrome c, somatic Homo sapiens 215-227 1322662-8 1992 Several other coumarins with one or more hydroxyl substituents were also capable of effectively removing superoxide anions (IC50 3.7-72 microM), although some could not be quantified due to direct rapid reduction of cytochrome c. Coumarins 14-23 cytochrome c, somatic Homo sapiens 216-228