You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
pyridin-3-yl-[4-[2-(2-pyrimidin-2-yl-1,3-thiazol-4-yl)ethylamino]piperidin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22N6OS
assistant