You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 1-[(2-chlorophenyl)methyl]-4-hydroxy-2-oxopyrrolo[1,2-b]pyridazine-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C17H15ClN2O4
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