You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(3S,8aS)-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[2,1-c][1,4]oxazin-3-yl]-N-[(4,5-dimethoxy-2-methylphenyl)methyl]methanamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H28N2O3
assistant