You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(3-amino-5-hydroxyphenyl)-3-chloro-6-oxo-5-(propan-2-ylamino)pyrazin-1-yl]-N-[(4-carbamimidoylphenyl)methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26ClN7O3
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