You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-[5-amino-3-methyl-6-oxo-4-(3-phenyl-1H-pyrazol-5-yl)pyridazin-1-yl]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H17N5O3
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