You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[5-(4-cyclopropylphenyl)-3-ethylsulfonylpyridin-2-yl]-6-(1,1-difluoroethyl)-3-methylimidazo[4,5-b]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H24F2N4O2S
assistant