You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (4Z)-7-(dimethylamino)-3,10,11-trihydroxy-4-hydroxyimino-1,12-dioxo-5,5a,6,12a-tetrahydro-4aH-tetracene-2-carboxamide into molecular formula.
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C21H21N3O7
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