Bodi Fluor™ 581/591 C11 is the same molecule as Bodipy 581/591 C11. It is a specific type of fluorescent dye used in various biological and biochemical applications. The "581/591" in the name refers to the wavelengths at which this particular Bodi Fluor dye exhibits maximum excitation (581 nm) and emission (591 nm). The "C11" part of the name typically indicates that the dye contains an 11-carbon aliphatic chain, which enhances its lipophilicity and makes it suitable for lipid-related studies. The lipophilic nature of the C11 moiety allows the dye to readily incorporate into cell membranes and other lipid-rich environments. One of the common applications of Bodi Fluor™ 581/591 C11 is to measure lipid peroxidation, a process involving the degradation of lipids through the action of reactive oxygen species (ROS). The dye's fluorescence changes with the oxidation state of lipids, and this unique property is exploited to assess lipid peroxidation levels in cells and tissues.