You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 8-[4-(aminodiazenyl)-3-(aminomethyl)phenyl]-1-cyclopropyl-9-methyl-4-oxoquinolizine-3-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C21H21N5O3
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