You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(5,6-dihydrobenzo[b][1]benzazepin-11-yl)-2-oxoethyl]-methylamino]-N-(3-methoxyphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H27N3O3
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