You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl 4-hydroxy-2-(14-methyl-8,15-dioxo-16-azatetracyclo[7.7.1.02,7.013,17]heptadeca-1(17),2(7),3,5,9,11,13-heptaen-6-yl)butanoate by IUPAC nomenclature, provide its molecular formula.
user
C22H19NO5
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