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system
Name the molecular formula for the molecule established as 11-(4-methoxyphenyl)-18-oxa-3,14,16-triazatetracyclo[8.8.0.02,7.012,17]octadeca-1(10),2(7),3,5,8,15-hexaen-13-one using the IUPAC nomenclature.
user
C21H17N3O3
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