You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[(2S,3R,4R)-2,3-dimethyl-4-[(2-methylpyridin-4-yl)amino]-3,4-dihydro-2H-quinolin-1-yl]ethanone ?
user
C19H23N3O
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