You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[amino-[(1S,2S)-2-pyrimidin-2-ylcyclobutyl]methylidene]-5-methyl-1-(4-methylpyridin-3-yl)pyrazole-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21N7O
assistant