You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule methyl 4-(2-bromophenyl)-6,16-diaza-4-azoniatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),2,4,7,10,12,14-heptaene-7-carboxylate;chloride .
user
C21H15BrClN3O2
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