You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-methylpropyl]-2-methyl-3-(methylamino)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H29N3O
assistant