You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7S)-7-[(1R)-1-methoxyethyl]-4,8-dimethyl-2-[[3-[[3-(trifluoromethyl)pyrazol-1-yl]methyl]cyclobutyl]amino]-5,7-dihydropteridin-6-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26F3N7O2
assistant