You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(7-acetyl-2-amino-6-oxo-7,8,9,10-tetrahydro-5H-cyclohepta[b]indol-3-yl)-2-methylpropanal The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H22N2O3
assistant