You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl (4Z)-1-(2-methoxyethyl)-2-methyl-5-oxo-4-[[2-(trifluoromethyl)phenyl]methylidene]pyrrole-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C18H18F3NO4
assistant