You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[4-[5-amino-6-[1-(1-methylpiperidin-4-yl)pyrazol-4-yl]oxypyrazin-2-yl]-2,6-dimethylphenyl]methyl]-3-cyclopentylurea is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H38N8O2
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