You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-(4-fluorophenyl)-N-[[4-(methoxymethyl)piperidin-4-yl]methyl]-5-methylthiophene-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C20H25FN2O2S
assistant