You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrol-2-yl-(3-amino-4-methylphenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H20N2O
assistant