You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[2-[4-chloro-N-[2-(diethylamino)ethyl]-2-(2-fluorobenzoyl)anilino]acetyl]amino]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C23H28ClFN4O3
assistant