Notes: 3-Hydroxycoumarin is a coumarin that has been found in A. reinwardtii and has diverse biological activities.{63230,63229,63231} It inhibits 15-lipoxygenase-1 (15-LO-1; IC50 = 9.5 µM).{63230} 3-hydroxycoumarin scavenges DPPH (Item No. 14805) radicals in a cell-free assay (IC50 = 0.61 mM) and inhibits lipid peroxidation in vitro (IC50 = 69.07 mM).{63229} It is protective against UVB-induced embryotoxicity in sea urchins (E. lucunter).{63231}