Answer
Oxidized: $C_{4}H_{6}O_{5}$; Reduced: NADH
Work Step by Step
The clues to finding the reduced and oxidized compounds: reduction will usually involve having more hydrogens in the reduced molecule, and energy carriers such as ATP and NADH are usually more reduced at the end of the process. Oxidation usually results in fewer hydrogens per molecule or even in conversion to carbon dioxide.
