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 N-[(1R,9R)-11-(3-methoxypropanoyl)-6-oxo-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-dien-5-yl]thiophene-2-carboxamide .
user
C20H23N3O4S
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