You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(cyclopropylsulfonylamino)pyrimidin-4-yl]-N-(4-pyridin-3-ylphenyl)prop-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H19N5O3S
assistant