You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-[(8aR)-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl]-2-(6-methylpyridin-2-yl)propanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H25N3O2
assistant