You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-phenyl-3,6,7,7a-tetrahydro-1H-pyrrolo[1,2-c][1,3]oxazol-5-one is given. What is its corresponding molecular formula?
user
C12H13NO2
assistant