Cytochrome subunit of fructose dehydrogenase, an enzyme that catalyzes the oxidation of D-fructose to produce 5-keto-D-fructose. In the complex, mediates both the electron transfer to ubiquinone and the anchoring of the complex to the membrane. Heterotrimer composed of FdhL, FdhS and FdhC. Binds 3 heme c groups covalently per subunit. This enzyme is commonly used in a number of research projects to examine the electrochemical properties of enzyme-catalyzed electrode reactions, named bioelectrocatalysis. Available as a commercial product from Sigma Aldrich (catalog number F4892).