You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3-benzyl-4-oxo-6-phenyl-5H-pyrrolo[3,2-d]pyrimidin-2-yl)sulfanyl]-N-[(2R)-butan-2-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H26N4O2S
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