You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[3-[4-(2-fluorophenyl)piperazin-1-yl]propyl]-2-(3-methyl-4-oxopyridazino[4,5-b]indol-5-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H31FN6O2
assistant