You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(oxolan-2-ylmethylamino)-N-[2-oxo-2-(2,3,4-trifluoroanilino)ethyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C15H18F3N3O3
assistant