You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[4-(3-acetamido-7,8,9-triazatricyclo[4.3.0.07,9]nona-1(6),2,4-trien-8-yl)-3-hydroxy-2-methylphenoxy]ethyl 2-methylprop-2-enoate by IUPAC nomenclature, provide its molecular formula.
user
C21H22N4O5
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