You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 4,4,4-trifluoro-1-[2-[2-(2-methyl-1H-indol-3-yl)acetyl]pyrazolidin-1-yl]butan-1-one using the IUPAC nomenclature.
user
C18H20F3N3O2
assistant