You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[1-[4-(morpholine-4-carbonyl)phenyl]triazol-4-yl]-1H-1,6-naphthyridin-2-one by IUPAC nomenclature, provide its molecular formula.
user
C21H18N6O3
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