You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(2-methylphenyl)methylamino]-2-oxoethyl] 2-methylpyrazolo[1,5-a]pyrimidine-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H18N4O3
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