You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-(4-acetyl-3,5-dimethyl-1H-pyrrol-2-yl)-2-[3-(3-nitrophenyl)-1,2,4-triazol-1-yl]ethanone .
user
C18H17N5O4
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