You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[2-[4-[2-(2-amino-4-oxo-3H-pteridin-6-yl)ethyl]phenyl]-2-oxoethyl]-5-oxo-5-[[(2S)-3-oxobutan-2-yl]amino]pentanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H28N6O6
assistant