You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[2-(4-methylanilino)-2-oxoethyl]sulfanyl-4-oxo-7-phenyl-5H-pyrrolo[3,2-d]pyrimidin-3-yl]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H20N4O4S
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