You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3aS,4R,6aR)-4,6a-dimethyl-2-oxo-3,3a,5,6-tetrahydrocyclopenta[b]furan-4-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C10H13NO2
assistant