You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[3-methyl-2-[(Z)-(2-oxo-1H-indol-3-ylidene)methyl]-2,3-dihydro-1H-pyrrol-4-yl]propanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H18N2O3
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