You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[2-[[6-[3-(2-ethoxyphenoxy)phenyl]pyrazin-2-yl]amino]-2-oxoethyl]phenoxy]-2-methylpropanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C30H29N3O6
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