You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3E)-6-fluoro-2-methyl-3-[[4-[(R)-methylsulfinyl]phenyl]methylidene]inden-1-yl]-N-(4-methylpyridin-2-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H23FN2O2S
assistant