You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(2-fluorophenyl)piperazin-1-yl]-3-(1-methylindol-3-yl)-3-thiophen-2-ylpropan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H26FN3OS
assistant