You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[5-(4-chlorophenyl)-1H-pyrazol-4-yl]methyl]-3-propan-2-yloxypropan-1-amine;oxalic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C18H24ClN3O5
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