You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6,7-dimethoxy-2-(4-methyl-2-pyrrol-1-ylpentanoyl)-3,4-dihydro-1H-isoquinoline-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H29N3O4
assistant