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 4-O-ethyl 2-O-[2-oxo-2-(3-phenylsulfanylpropylamino)ethyl] 3,5-dimethyl-1H-pyrrole-2,4-dicarboxylate ?
user
C21H26N2O5S
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