You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(2-methylphenyl)-3-(4-methylsulfonylphenyl)-5-(trifluoromethyl)pyrazol-1-yl]butanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H21F3N2O4S
assistant