You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-[[2-(8-methyl-4H-chromeno[4,3-c]pyrazol-1-yl)acetyl]amino]piperidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26N4O4
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