You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[1-[2-(2-methoxyphenyl)ethyl]pyrrolo[1,2-a]pyrazin-6-yl]-N,N-dimethylmethanamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H23N3O
assistant