You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-amino-6-[1-methyl-5-(1-phenylcyclopropyl)-1,2,4-triazol-3-yl]pyrazin-2-yl]pyrazole-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H19N9O
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