You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[4-[(4-methylphenyl)methyl]piperazin-1-yl]-3,4-dihydro-2H-indigine-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H26InN3O
assistant