C5H5O2 is a chemical formula representing a compound with 5 carbon atoms, 5 hydrogen atoms, and 2 oxygen atoms. Without more specific information, it is difficult to determine the exact identity of this compound.
It's either 3-Deoxyglucosone OR Levoglucosan - depending on how
the atoms are arranged n the molecule. BOTH substances have the
same chemical formula C6H10O5