You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-ethyl-3-[(1S)-1-[(1R)-2-[(4-fluorophenyl)methyl]-6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-1-yl]ethyl]urea .
user
C23H30FN3O3
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