You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (7S)-7-[(1R)-1-methoxyethyl]-4,8-dimethyl-2-[[3-(3,4,5-trifluorophenoxy)cyclobutyl]amino]-5,7-dihydropteridin-6-one ?
user
C21H24F3N5O3
assistant