You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[2-hydroxy-3-(4-methoxyphenyl)-2-methylpropyl]pyrrolidin-1-yl]-1-(5-hydroxypyridin-2-yl)ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H28N2O4
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