You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[3-[2-[3-[(1R)-2-methoxy-1-[(2-methylpropan-2-yl)oxycarbonylamino]ethyl]phenyl]ethylamino]-6-methyl-2-oxopyrazin-1-yl]acetic acid by IUPAC nomenclature, provide its molecular formula.
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C23H32N4O6
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