You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S,7S,10R)-7-(2-hydroxyethyl)-17-methoxy-8,11,21-triazahexacyclo[11.8.0.02,4.02,10.04,8.015,20]henicosa-1(13),14,16,18,20-pentaen-12-one into molecular formula.
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C21H23N3O3
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