You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-hydroxy-9-[3-[2-[hydroxy(oxido)azaniumyl]imidazol-1-yl]propylamino]acridin-1-amine oxide;hydrochloride into its molecular formula.
user
C19H21ClN6O4
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